diff --git a/app/webrtc/portallocatorfactory.cc b/app/webrtc/portallocatorfactory.cc
index a436c44..7263c5d 100644
--- a/app/webrtc/portallocatorfactory.cc
+++ b/app/webrtc/portallocatorfactory.cc
@@ -55,19 +55,15 @@
 cricket::PortAllocator* PortAllocatorFactory::CreatePortAllocator(
     const std::vector<StunConfiguration>& stun,
     const std::vector<TurnConfiguration>& turn) {
-  std::vector<talk_base::SocketAddress> stun_hosts;
+  cricket::ServerAddresses stun_hosts;
   typedef std::vector<StunConfiguration>::const_iterator StunIt;
   for (StunIt stun_it = stun.begin(); stun_it != stun.end(); ++stun_it) {
-    stun_hosts.push_back(stun_it->server);
+    stun_hosts.insert(stun_it->server);
   }
 
-  talk_base::SocketAddress stun_addr;
-  if (!stun_hosts.empty()) {
-    stun_addr = stun_hosts.front();
-  }
   scoped_ptr<cricket::BasicPortAllocator> allocator(
       new cricket::BasicPortAllocator(
-          network_manager_.get(), socket_factory_.get(), stun_addr));
+          network_manager_.get(), socket_factory_.get(), stun_hosts));
 
   for (size_t i = 0; i < turn.size(); ++i) {
     cricket::RelayCredentials credentials(turn[i].username, turn[i].password);
diff --git a/app/webrtc/webrtcsession_unittest.cc b/app/webrtc/webrtcsession_unittest.cc
index a1d48cf..460d4a4 100644
--- a/app/webrtc/webrtcsession_unittest.cc
+++ b/app/webrtc/webrtcsession_unittest.cc
@@ -306,12 +306,16 @@
                                                  cricket::STUN_SERVER_PORT)),
       stun_server_(Thread::Current(), stun_socket_addr_),
       turn_server_(Thread::Current(), kTurnUdpIntAddr, kTurnUdpExtAddr),
-      allocator_(new cricket::BasicPortAllocator(
-          &network_manager_, stun_socket_addr_,
-          SocketAddress(), SocketAddress(), SocketAddress())),
       mediastream_signaling_(channel_manager_.get()),
       ice_type_(PeerConnectionInterface::kAll) {
     tdesc_factory_->set_protocol(cricket::ICEPROTO_HYBRID);
+
+    cricket::ServerAddresses stun_servers;
+    stun_servers.insert(stun_socket_addr_);
+    allocator_.reset(new cricket::BasicPortAllocator(
+        &network_manager_,
+        stun_servers,
+        SocketAddress(), SocketAddress(), SocketAddress()));
     allocator_->set_flags(cricket::PORTALLOCATOR_DISABLE_TCP |
                          cricket::PORTALLOCATOR_DISABLE_RELAY |
                          cricket::PORTALLOCATOR_ENABLE_BUNDLE);
diff --git a/examples/call/callclient.cc b/examples/call/callclient.cc
index 849455e..c691db3 100644
--- a/examples/call/callclient.cc
+++ b/examples/call/callclient.cc
@@ -490,8 +490,10 @@
 
   // TODO: Decide if the relay address should be specified here.
   talk_base::SocketAddress stun_addr("stun.l.google.com", 19302);
+  cricket::ServerAddresses stun_servers;
+  stun_servers.insert(stun_addr);
   port_allocator_ =  new cricket::BasicPortAllocator(
-      network_manager_, stun_addr, talk_base::SocketAddress(),
+      network_manager_, stun_servers, talk_base::SocketAddress(),
       talk_base::SocketAddress(), talk_base::SocketAddress());
 
   if (portallocator_flags_ != 0) {
diff --git a/p2p/base/p2ptransportchannel_unittest.cc b/p2p/base/p2ptransportchannel_unittest.cc
index 498fde9..f65f502 100644
--- a/p2p/base/p2ptransportchannel_unittest.cc
+++ b/p2p/base/p2ptransportchannel_unittest.cc
@@ -50,6 +50,7 @@
 using cricket::kDefaultStepDelay;
 using cricket::PORTALLOCATOR_ENABLE_SHARED_UFRAG;
 using cricket::PORTALLOCATOR_ENABLE_SHARED_SOCKET;
+using cricket::ServerAddresses;
 using talk_base::SocketAddress;
 
 static const int kDefaultTimeout = 1000;
@@ -152,12 +153,14 @@
     ep1_.role_ = cricket::ICEROLE_CONTROLLING;
     ep2_.role_ = cricket::ICEROLE_CONTROLLED;
 
+    ServerAddresses stun_servers;
+    stun_servers.insert(kStunAddr);
     ep1_.allocator_.reset(new cricket::BasicPortAllocator(
-        &ep1_.network_manager_, kStunAddr, kRelayUdpIntAddr,
-        kRelayTcpIntAddr, kRelaySslTcpIntAddr));
+        &ep1_.network_manager_,
+        stun_servers, kRelayUdpIntAddr, kRelayTcpIntAddr, kRelaySslTcpIntAddr));
     ep2_.allocator_.reset(new cricket::BasicPortAllocator(
-        &ep2_.network_manager_, kStunAddr, kRelayUdpIntAddr,
-        kRelayTcpIntAddr, kRelaySslTcpIntAddr));
+        &ep2_.network_manager_,
+        stun_servers, kRelayUdpIntAddr, kRelayTcpIntAddr, kRelaySslTcpIntAddr));
   }
 
  protected:
@@ -806,13 +809,17 @@
     // Ideally we want to use TURN server for both GICE and ICE, but in case
     // of GICE, TURN server usage is not producing results reliabally.
     // TODO(mallinath): Remove Relay and use TURN server for all tests.
+    ServerAddresses stun_servers;
+    stun_servers.insert(kStunAddr);
     GetEndpoint(0)->allocator_.reset(
         new cricket::BasicPortAllocator(&(GetEndpoint(0)->network_manager_),
-        kStunAddr, talk_base::SocketAddress(), talk_base::SocketAddress(),
+        stun_servers,
+        talk_base::SocketAddress(), talk_base::SocketAddress(),
         talk_base::SocketAddress()));
     GetEndpoint(1)->allocator_.reset(
         new cricket::BasicPortAllocator(&(GetEndpoint(1)->network_manager_),
-        kStunAddr, talk_base::SocketAddress(), talk_base::SocketAddress(),
+        stun_servers,
+        talk_base::SocketAddress(), talk_base::SocketAddress(),
         talk_base::SocketAddress()));
 
     cricket::RelayServerConfig relay_server(cricket::RELAY_GTURN);
diff --git a/p2p/base/port.h b/p2p/base/port.h
index 39d4e25..9613264 100644
--- a/p2p/base/port.h
+++ b/p2p/base/port.h
@@ -31,6 +31,7 @@
 #include <string>
 #include <vector>
 #include <map>
+#include <set>
 
 #include "talk/base/asyncpacketsocket.h"
 #include "talk/base/network.h"
@@ -109,6 +110,8 @@
       : address(a), proto(p), secure(sec) { }
 };
 
+typedef std::set<talk_base::SocketAddress> ServerAddresses;
+
 // Represents a local communication mechanism that can be used to create
 // connections to similar mechanisms of the other client.  Subclasses of this
 // one add support for specific mechanisms like local UDP ports.
diff --git a/p2p/base/port_unittest.cc b/p2p/base/port_unittest.cc
index dcddc46..f4f9935 100644
--- a/p2p/base/port_unittest.cc
+++ b/p2p/base/port_unittest.cc
@@ -453,9 +453,11 @@
   }
   StunPort* CreateStunPort(const SocketAddress& addr,
                            talk_base::PacketSocketFactory* factory) {
+    ServerAddresses stun_servers;
+    stun_servers.insert(kStunAddr);
     StunPort* port = StunPort::Create(main_, factory, &network_,
                                       addr.ipaddr(), 0, 0,
-                                      username_, password_, kStunAddr);
+                                      username_, password_, stun_servers);
     port->SetIceProtocolType(ice_protocol_);
     return port;
   }
diff --git a/p2p/base/stunport.cc b/p2p/base/stunport.cc
index 6e18fc5..0a051cb 100644
--- a/p2p/base/stunport.cc
+++ b/p2p/base/stunport.cc
@@ -69,10 +69,10 @@
       LOG(LS_ERROR) << "Binding address has bad family";
     } else {
       talk_base::SocketAddress addr(addr_attr->ipaddr(), addr_attr->port());
-      port_->OnStunBindingRequestSucceeded(addr);
+      port_->OnStunBindingRequestSucceeded(server_addr_, addr);
     }
 
-    // We will do a keep-alive regardless of whether this request suceeds.
+    // We will do a keep-alive regardless of whether this request succeeds.
     // This should have almost no impact on network usage.
     if (keep_alive_) {
       port_->requests_.SendDelayed(
@@ -92,7 +92,7 @@
                  << " reason='" << attr->reason() << "'";
     }
 
-    port_->OnStunBindingOrResolveRequestFailed();
+    port_->OnStunBindingOrResolveRequestFailed(server_addr_);
 
     if (keep_alive_
         && (talk_base::TimeSince(start_time_) <= RETRY_TIMEOUT)) {
@@ -107,7 +107,7 @@
       << port_->GetLocalAddress().ToSensitiveString()
       << " (" << port_->Network()->name() << ")";
 
-    port_->OnStunBindingOrResolveRequestFailed();
+    port_->OnStunBindingOrResolveRequestFailed(server_addr_);
 
     if (keep_alive_
         && (talk_base::TimeSince(start_time_) <= RETRY_TIMEOUT)) {
@@ -120,10 +120,60 @@
  private:
   UDPPort* port_;
   bool keep_alive_;
-  talk_base::SocketAddress server_addr_;
+  const talk_base::SocketAddress server_addr_;
   uint32 start_time_;
 };
 
+UDPPort::AddressResolver::AddressResolver(
+    talk_base::PacketSocketFactory* factory)
+    : socket_factory_(factory) {}
+
+UDPPort::AddressResolver::~AddressResolver() {
+  for (ResolverMap::iterator it = resolvers_.begin();
+       it != resolvers_.end(); ++it) {
+    it->second->Destroy(true);
+  }
+}
+
+void UDPPort::AddressResolver::Resolve(
+    const talk_base::SocketAddress& address) {
+  if (resolvers_.find(address) != resolvers_.end())
+    return;
+
+  talk_base::AsyncResolverInterface* resolver =
+      socket_factory_->CreateAsyncResolver();
+  resolvers_.insert(
+      std::pair<talk_base::SocketAddress, talk_base::AsyncResolverInterface*>(
+          address, resolver));
+
+  resolver->SignalDone.connect(this,
+                               &UDPPort::AddressResolver::OnResolveResult);
+
+  resolver->Start(address);
+}
+
+bool UDPPort::AddressResolver::GetResolvedAddress(
+    const talk_base::SocketAddress& input,
+    int family,
+    talk_base::SocketAddress* output) const {
+  ResolverMap::const_iterator it = resolvers_.find(input);
+  if (it == resolvers_.end())
+    return false;
+
+  return it->second->GetResolvedAddress(family, output);
+}
+
+void UDPPort::AddressResolver::OnResolveResult(
+    talk_base::AsyncResolverInterface* resolver) {
+  for (ResolverMap::iterator it = resolvers_.begin();
+       it != resolvers_.end(); ++it) {
+    if (it->second == resolver) {
+      SignalDone(it->first, resolver->GetError());
+      return;
+    }
+  }
+}
+
 UDPPort::UDPPort(talk_base::Thread* thread,
                  talk_base::PacketSocketFactory* factory,
                  talk_base::Network* network,
@@ -134,7 +184,6 @@
       requests_(thread),
       socket_(socket),
       error_(0),
-      resolver_(NULL),
       ready_(false),
       stun_keepalive_delay_(KEEPALIVE_DELAY) {
 }
@@ -149,7 +198,6 @@
       requests_(thread),
       socket_(NULL),
       error_(0),
-      resolver_(NULL),
       ready_(false),
       stun_keepalive_delay_(KEEPALIVE_DELAY) {
 }
@@ -172,9 +220,6 @@
 }
 
 UDPPort::~UDPPort() {
-  if (resolver_) {
-    resolver_->Destroy(true);
-  }
   if (!SharedSocket())
     delete socket_;
 }
@@ -189,11 +234,11 @@
 void UDPPort::MaybePrepareStunCandidate() {
   // Sending binding request to the STUN server if address is available to
   // prepare STUN candidate.
-  if (!server_addr_.IsNil()) {
-    SendStunBindingRequest();
+  if (!server_addresses_.empty()) {
+    SendStunBindingRequests();
   } else {
     // Port is done allocating candidates.
-    SetResult(true);
+    MaybeSetPortCompleteOrError();
   }
 }
 
@@ -254,12 +299,13 @@
   const talk_base::SocketAddress& remote_addr,
   const talk_base::PacketTime& packet_time) {
   ASSERT(socket == socket_);
+  ASSERT(!remote_addr.IsUnresolved());
 
   // Look for a response from the STUN server.
   // Even if the response doesn't match one of our outstanding requests, we
   // will eat it because it might be a response to a retransmitted packet, and
   // we already cleared the request when we got the first response.
-  if (!server_addr_.IsUnresolved() && remote_addr == server_addr_) {
+  if (server_addresses_.find(remote_addr) != server_addresses_.end()) {
     requests_.CheckResponse(data, size);
     return;
   }
@@ -275,76 +321,114 @@
   Port::OnReadyToSend();
 }
 
-void UDPPort::SendStunBindingRequest() {
+void UDPPort::SendStunBindingRequests() {
   // We will keep pinging the stun server to make sure our NAT pin-hole stays
   // open during the call.
-  // TODO: Support multiple stun servers, or make ResolveStunAddress find a
-  // server with the correct family, or something similar.
   ASSERT(requests_.empty());
-  if (server_addr_.IsUnresolved()) {
-    ResolveStunAddress();
+
+  for (ServerAddresses::const_iterator it = server_addresses_.begin();
+       it != server_addresses_.end(); ++it) {
+    SendStunBindingRequest(*it);
+  }
+}
+
+void UDPPort::ResolveStunAddress(const talk_base::SocketAddress& stun_addr) {
+  if (!resolver_) {
+    resolver_.reset(new AddressResolver(socket_factory()));
+    resolver_->SignalDone.connect(this, &UDPPort::OnResolveResult);
+  }
+
+  resolver_->Resolve(stun_addr);
+}
+
+void UDPPort::OnResolveResult(const talk_base::SocketAddress& input,
+                              int error) {
+  ASSERT(resolver_.get());
+
+  talk_base::SocketAddress resolved;
+  if (error != 0 ||
+      !resolver_->GetResolvedAddress(input, ip().family(), &resolved))  {
+    LOG_J(LS_WARNING, this) << "StunPort: stun host lookup received error "
+                            << error;
+    OnStunBindingOrResolveRequestFailed(input);
+    return;
+  }
+
+  server_addresses_.erase(input);
+
+  if (server_addresses_.find(resolved) == server_addresses_.end()) {
+    server_addresses_.insert(resolved);
+    SendStunBindingRequest(resolved);
+  }
+}
+
+void UDPPort::SendStunBindingRequest(
+    const talk_base::SocketAddress& stun_addr) {
+  if (stun_addr.IsUnresolved()) {
+    ResolveStunAddress(stun_addr);
+
   } else if (socket_->GetState() == talk_base::AsyncPacketSocket::STATE_BOUND) {
     // Check if |server_addr_| is compatible with the port's ip.
-    if (IsCompatibleAddress(server_addr_)) {
-      requests_.Send(new StunBindingRequest(this, true, server_addr_));
+    if (IsCompatibleAddress(stun_addr)) {
+      requests_.Send(new StunBindingRequest(this, true, stun_addr));
     } else {
       // Since we can't send stun messages to the server, we should mark this
       // port ready.
-      OnStunBindingOrResolveRequestFailed();
+      LOG(LS_WARNING) << "STUN server address is incompatible.";
+      OnStunBindingOrResolveRequestFailed(stun_addr);
     }
   }
 }
 
-void UDPPort::ResolveStunAddress() {
-  if (resolver_)
-    return;
-
-  resolver_ = socket_factory()->CreateAsyncResolver();
-  resolver_->SignalDone.connect(this, &UDPPort::OnResolveResult);
-  resolver_->Start(server_addr_);
-}
-
-void UDPPort::OnResolveResult(talk_base::AsyncResolverInterface* resolver) {
-  ASSERT(resolver == resolver_);
-  if (resolver_->GetError() != 0 ||
-      !resolver_->GetResolvedAddress(ip().family(), &server_addr_))  {
-    LOG_J(LS_WARNING, this) << "StunPort: stun host lookup received error "
-                            << resolver_->GetError();
-    OnStunBindingOrResolveRequestFailed();
+void UDPPort::OnStunBindingRequestSucceeded(
+    const talk_base::SocketAddress& stun_server_addr,
+    const talk_base::SocketAddress& stun_reflected_addr) {
+  if (bind_request_succeeded_servers_.find(stun_server_addr) !=
+          bind_request_succeeded_servers_.end()) {
     return;
   }
+  bind_request_succeeded_servers_.insert(stun_server_addr);
 
-  SendStunBindingRequest();
-}
-
-void UDPPort::OnStunBindingRequestSucceeded(
-    const talk_base::SocketAddress& stun_addr) {
-  if (ready_)  // Discarding the binding response if port is already enabled.
-    return;
-
-  if (!SharedSocket() || stun_addr != socket_->GetLocalAddress()) {
-    // If socket is shared and |stun_addr| is equal to local socket
+  if (!SharedSocket() || stun_reflected_addr != socket_->GetLocalAddress()) {
+    // If socket is shared and |stun_reflected_addr| is equal to local socket
     // address then discarding the stun address.
     // For STUN related address is local socket address.
-    AddAddress(stun_addr, socket_->GetLocalAddress(),
+    AddAddress(stun_reflected_addr, socket_->GetLocalAddress(),
                socket_->GetLocalAddress(), UDP_PROTOCOL_NAME,
                STUN_PORT_TYPE, ICE_TYPE_PREFERENCE_SRFLX, false);
   }
-  SetResult(true);
+  MaybeSetPortCompleteOrError();
 }
 
-void UDPPort::OnStunBindingOrResolveRequestFailed() {
-  if (ready_)  // Discarding failure response if port is already enabled.
+void UDPPort::OnStunBindingOrResolveRequestFailed(
+    const talk_base::SocketAddress& stun_server_addr) {
+  if (bind_request_failed_servers_.find(stun_server_addr) !=
+          bind_request_failed_servers_.end()) {
+    return;
+  }
+  bind_request_failed_servers_.insert(stun_server_addr);
+  MaybeSetPortCompleteOrError();
+}
+
+void UDPPort::MaybeSetPortCompleteOrError() {
+  if (ready_)
     return;
 
-  // If socket is shared, we should process local udp candidate.
-  SetResult(SharedSocket());
-}
+  // Do not set port ready if we are still waiting for bind responses.
+  const size_t servers_done_bind_request = bind_request_failed_servers_.size() +
+      bind_request_succeeded_servers_.size();
+  if (server_addresses_.size() != servers_done_bind_request) {
+    return;
+  }
 
-void UDPPort::SetResult(bool success) {
   // Setting ready status.
   ready_ = true;
-  if (success) {
+
+  // The port is "completed" if there is no stun server provided, or the bind
+  // request succeeded for any stun server, or the socket is shared.
+  if (server_addresses_.empty() ||
+      bind_request_succeeded_servers_.size() > 0 ||
+      SharedSocket()) {
     SignalPortComplete(this);
   } else {
     SignalPortError(this);
diff --git a/p2p/base/stunport.h b/p2p/base/stunport.h
index c45d6af..367db22 100644
--- a/p2p/base/stunport.h
+++ b/p2p/base/stunport.h
@@ -82,9 +82,12 @@
     return socket_->GetLocalAddress();
   }
 
-  const talk_base::SocketAddress& server_addr() const { return server_addr_; }
-  void set_server_addr(const talk_base::SocketAddress& addr) {
-    server_addr_ = addr;
+  const ServerAddresses server_addresses() const {
+    return server_addresses_;
+  }
+  void
+  set_server_addresses(const ServerAddresses& addresses) {
+    server_addresses_ = addresses;
   }
 
   virtual void PrepareAddress();
@@ -140,29 +143,64 @@
   // This method will send STUN binding request if STUN server address is set.
   void MaybePrepareStunCandidate();
 
-  void SendStunBindingRequest();
+  void SendStunBindingRequests();
 
  private:
+  // A helper class which can be called repeatedly to resolve multiple
+  // addresses, as opposed to talk_base::AsyncResolverInterface, which can only
+  // resolve one address per instance.
+  class AddressResolver : public sigslot::has_slots<> {
+   public:
+    explicit AddressResolver(talk_base::PacketSocketFactory* factory);
+    ~AddressResolver();
+
+    void Resolve(const talk_base::SocketAddress& address);
+    bool GetResolvedAddress(const talk_base::SocketAddress& input,
+                            int family,
+                            talk_base::SocketAddress* output) const;
+
+    // The signal is sent when resolving the specified address is finished. The
+    // first argument is the input address, the second argument is the error
+    // or 0 if it succeeded.
+    sigslot::signal2<const talk_base::SocketAddress&, int> SignalDone;
+
+   private:
+    typedef std::map<talk_base::SocketAddress,
+                     talk_base::AsyncResolverInterface*> ResolverMap;
+
+    void OnResolveResult(talk_base::AsyncResolverInterface* resolver);
+
+    talk_base::PacketSocketFactory* socket_factory_;
+    ResolverMap resolvers_;
+  };
+
   // DNS resolution of the STUN server.
-  void ResolveStunAddress();
-  void OnResolveResult(talk_base::AsyncResolverInterface* resolver);
+  void ResolveStunAddress(const talk_base::SocketAddress& stun_addr);
+  void OnResolveResult(const talk_base::SocketAddress& input, int error);
+
+  void SendStunBindingRequest(const talk_base::SocketAddress& stun_addr);
 
   // Below methods handles binding request responses.
-  void OnStunBindingRequestSucceeded(const talk_base::SocketAddress& stun_addr);
-  void OnStunBindingOrResolveRequestFailed();
+  void OnStunBindingRequestSucceeded(
+      const talk_base::SocketAddress& stun_server_addr,
+      const talk_base::SocketAddress& stun_reflected_addr);
+  void OnStunBindingOrResolveRequestFailed(
+      const talk_base::SocketAddress& stun_server_addr);
 
   // Sends STUN requests to the server.
   void OnSendPacket(const void* data, size_t size, StunRequest* req);
 
   // TODO(mallinaht) - Move this up to cricket::Port when SignalAddressReady is
   // changed to SignalPortReady.
-  void SetResult(bool success);
+  void MaybeSetPortCompleteOrError();
 
-  talk_base::SocketAddress server_addr_;
+  ServerAddresses server_addresses_;
+  ServerAddresses bind_request_succeeded_servers_;
+  ServerAddresses bind_request_failed_servers_;
   StunRequestManager requests_;
   talk_base::AsyncPacketSocket* socket_;
   int error_;
-  talk_base::AsyncResolverInterface* resolver_;
+  talk_base::scoped_ptr<AddressResolver> resolver_;
   bool ready_;
   int stun_keepalive_delay_;
 
@@ -171,17 +209,18 @@
 
 class StunPort : public UDPPort {
  public:
-  static StunPort* Create(talk_base::Thread* thread,
-                          talk_base::PacketSocketFactory* factory,
-                          talk_base::Network* network,
-                          const talk_base::IPAddress& ip,
-                          int min_port, int max_port,
-                          const std::string& username,
-                          const std::string& password,
-                          const talk_base::SocketAddress& server_addr) {
+  static StunPort* Create(
+      talk_base::Thread* thread,
+      talk_base::PacketSocketFactory* factory,
+      talk_base::Network* network,
+      const talk_base::IPAddress& ip,
+      int min_port, int max_port,
+      const std::string& username,
+      const std::string& password,
+      const ServerAddresses& servers) {
     StunPort* port = new StunPort(thread, factory, network,
                                   ip, min_port, max_port,
-                                  username, password, server_addr);
+                                  username, password, servers);
     if (!port->Init()) {
       delete port;
       port = NULL;
@@ -192,7 +231,7 @@
   virtual ~StunPort() {}
 
   virtual void PrepareAddress() {
-    SendStunBindingRequest();
+    SendStunBindingRequests();
   }
 
  protected:
@@ -200,12 +239,12 @@
            talk_base::Network* network, const talk_base::IPAddress& ip,
            int min_port, int max_port,
            const std::string& username, const std::string& password,
-           const talk_base::SocketAddress& server_address)
+           const ServerAddresses& servers)
      : UDPPort(thread, factory, network, ip, min_port, max_port, username,
                password) {
     // UDPPort will set these to local udp, updating these to STUN.
     set_type(STUN_PORT_TYPE);
-    set_server_addr(server_address);
+    set_server_addresses(servers);
   }
 };
 
diff --git a/p2p/base/stunport_unittest.cc b/p2p/base/stunport_unittest.cc
index 5850027..0965712 100644
--- a/p2p/base/stunport_unittest.cc
+++ b/p2p/base/stunport_unittest.cc
@@ -30,15 +30,18 @@
 #include "talk/base/physicalsocketserver.h"
 #include "talk/base/scoped_ptr.h"
 #include "talk/base/socketaddress.h"
+#include "talk/base/ssladapter.h"
 #include "talk/base/virtualsocketserver.h"
 #include "talk/p2p/base/basicpacketsocketfactory.h"
 #include "talk/p2p/base/stunport.h"
 #include "talk/p2p/base/teststunserver.h"
 
+using cricket::ServerAddresses;
 using talk_base::SocketAddress;
 
 static const SocketAddress kLocalAddr("127.0.0.1", 0);
-static const SocketAddress kStunAddr("127.0.0.1", 5000);
+static const SocketAddress kStunAddr1("127.0.0.1", 5000);
+static const SocketAddress kStunAddr2("127.0.0.1", 4000);
 static const SocketAddress kBadAddr("0.0.0.1", 5000);
 static const SocketAddress kStunHostnameAddr("localhost", 5000);
 static const SocketAddress kBadHostnameAddr("not-a-real-hostname", 5000);
@@ -58,8 +61,10 @@
         ss_scope_(ss_.get()),
         network_("unittest", "unittest", talk_base::IPAddress(INADDR_ANY), 32),
         socket_factory_(talk_base::Thread::Current()),
-        stun_server_(new cricket::TestStunServer(
-          talk_base::Thread::Current(), kStunAddr)),
+        stun_server_1_(new cricket::TestStunServer(
+          talk_base::Thread::Current(), kStunAddr1)),
+        stun_server_2_(new cricket::TestStunServer(
+          talk_base::Thread::Current(), kStunAddr2)),
         done_(false), error_(false), stun_keepalive_delay_(0) {
   }
 
@@ -68,10 +73,16 @@
   bool error() const { return error_; }
 
   void CreateStunPort(const talk_base::SocketAddress& server_addr) {
+    ServerAddresses stun_servers;
+    stun_servers.insert(server_addr);
+    CreateStunPort(stun_servers);
+  }
+
+  void CreateStunPort(const ServerAddresses& stun_servers) {
     stun_port_.reset(cricket::StunPort::Create(
         talk_base::Thread::Current(), &socket_factory_, &network_,
         kLocalAddr.ipaddr(), 0, 0, talk_base::CreateRandomString(16),
-        talk_base::CreateRandomString(22), server_addr));
+        talk_base::CreateRandomString(22), stun_servers));
     stun_port_->set_stun_keepalive_delay(stun_keepalive_delay_);
     stun_port_->SignalPortComplete.connect(this,
         &StunPortTest::OnPortComplete);
@@ -89,7 +100,9 @@
         &network_, socket_.get(),
         talk_base::CreateRandomString(16), talk_base::CreateRandomString(22)));
     ASSERT_TRUE(stun_port_ != NULL);
-    stun_port_->set_server_addr(server_addr);
+    ServerAddresses stun_servers;
+    stun_servers.insert(server_addr);
+    stun_port_->set_server_addresses(stun_servers);
     stun_port_->SignalPortComplete.connect(this,
         &StunPortTest::OnPortComplete);
     stun_port_->SignalPortError.connect(this,
@@ -115,11 +128,17 @@
 
  protected:
   static void SetUpTestCase() {
+    talk_base::InitializeSSL();
     // Ensure the RNG is inited.
     talk_base::InitRandom(NULL, 0);
+
+  }
+  static void TearDownTestCase() {
+    talk_base::CleanupSSL();
   }
 
   void OnPortComplete(cricket::Port* port) {
+    ASSERT_FALSE(done_);
     done_ = true;
     error_ = false;
   }
@@ -138,7 +157,8 @@
   talk_base::Network network_;
   talk_base::BasicPacketSocketFactory socket_factory_;
   talk_base::scoped_ptr<cricket::UDPPort> stun_port_;
-  talk_base::scoped_ptr<cricket::TestStunServer> stun_server_;
+  talk_base::scoped_ptr<cricket::TestStunServer> stun_server_1_;
+  talk_base::scoped_ptr<cricket::TestStunServer> stun_server_2_;
   talk_base::scoped_ptr<talk_base::AsyncPacketSocket> socket_;
   bool done_;
   bool error_;
@@ -147,14 +167,14 @@
 
 // Test that we can create a STUN port
 TEST_F(StunPortTest, TestBasic) {
-  CreateStunPort(kStunAddr);
+  CreateStunPort(kStunAddr1);
   EXPECT_EQ("stun", port()->Type());
   EXPECT_EQ(0U, port()->Candidates().size());
 }
 
 // Test that we can get an address from a STUN server.
 TEST_F(StunPortTest, TestPrepareAddress) {
-  CreateStunPort(kStunAddr);
+  CreateStunPort(kStunAddr1);
   PrepareAddress();
   EXPECT_TRUE_WAIT(done(), kTimeoutMs);
   ASSERT_EQ(1U, port()->Candidates().size());
@@ -209,7 +229,7 @@
 
 // Test that a local candidate can be generated using a shared socket.
 TEST_F(StunPortTest, TestSharedSocketPrepareAddress) {
-  CreateSharedStunPort(kStunAddr);
+  CreateSharedStunPort(kStunAddr1);
   PrepareAddress();
   EXPECT_TRUE_WAIT(done(), kTimeoutMs);
   ASSERT_EQ(1U, port()->Candidates().size());
@@ -232,3 +252,28 @@
   SendData(data.c_str(), data.length());
   // No crash is success.
 }
+
+// Test that candidates can be allocated for multiple STUN servers.
+TEST_F(StunPortTest, TestMultipleGoodStunServers) {
+  ServerAddresses stun_servers;
+  stun_servers.insert(kStunAddr1);
+  stun_servers.insert(kStunAddr2);
+  CreateStunPort(stun_servers);
+  EXPECT_EQ("stun", port()->Type());
+  PrepareAddress();
+  EXPECT_TRUE_WAIT(done(), kTimeoutMs);
+  EXPECT_EQ(2U, port()->Candidates().size());
+}
+
+// Test that candidates can be allocated for multiple STUN servers, one of which
+// is not reachable.
+TEST_F(StunPortTest, TestMultipleStunServersWithBadServer) {
+  ServerAddresses stun_servers;
+  stun_servers.insert(kStunAddr1);
+  stun_servers.insert(kBadAddr);
+  CreateStunPort(stun_servers);
+  EXPECT_EQ("stun", port()->Type());
+  PrepareAddress();
+  EXPECT_TRUE_WAIT(done(), kTimeoutMs);
+  EXPECT_EQ(1U, port()->Candidates().size());
+}
diff --git a/p2p/client/basicportallocator.cc b/p2p/client/basicportallocator.cc
index aa16517..46fbf49 100644
--- a/p2p/client/basicportallocator.cc
+++ b/p2p/client/basicportallocator.cc
@@ -186,23 +186,23 @@
 BasicPortAllocator::BasicPortAllocator(
     talk_base::NetworkManager* network_manager,
     talk_base::PacketSocketFactory* socket_factory,
-    const talk_base::SocketAddress& stun_address)
+    const ServerAddresses& stun_servers)
     : network_manager_(network_manager),
       socket_factory_(socket_factory),
-      stun_address_(stun_address) {
+      stun_servers_(stun_servers) {
   ASSERT(socket_factory_ != NULL);
   Construct();
 }
 
 BasicPortAllocator::BasicPortAllocator(
     talk_base::NetworkManager* network_manager,
-    const talk_base::SocketAddress& stun_address,
+    const ServerAddresses& stun_servers,
     const talk_base::SocketAddress& relay_address_udp,
     const talk_base::SocketAddress& relay_address_tcp,
     const talk_base::SocketAddress& relay_address_ssl)
     : network_manager_(network_manager),
       socket_factory_(NULL),
-      stun_address_(stun_address) {
+      stun_servers_(stun_servers) {
 
   RelayServerConfig config(RELAY_GTURN);
   if (!relay_address_udp.IsNil())
@@ -333,7 +333,7 @@
 }
 
 void BasicPortAllocatorSession::GetPortConfigurations() {
-  PortConfiguration* config = new PortConfiguration(allocator_->stun_address(),
+  PortConfiguration* config = new PortConfiguration(allocator_->stun_servers(),
                                                     username(),
                                                     password());
 
@@ -422,7 +422,7 @@
       }
 
       // Disables phases that are not specified in this config.
-      if (!config || config->stun_address.IsNil()) {
+      if (!config || config->StunServers().empty()) {
         // No STUN ports specified in this config.
         sequence_flags |= PORTALLOCATOR_DISABLE_STUN;
       }
@@ -753,8 +753,8 @@
   *flags |= PORTALLOCATOR_DISABLE_TCP;
 
   if (config_ && config) {
-    if (config_->stun_address == config->stun_address) {
-      // Already got this STUN server covered.
+    if (config_->StunServers() == config->StunServers()) {
+      // Already got this STUN servers covered.
       *flags |= PORTALLOCATOR_DISABLE_STUN;
     }
     if (!config_->relays.empty()) {
@@ -878,15 +878,15 @@
 
       // If STUN is not disabled, setting stun server address to port.
       if (!IsFlagSet(PORTALLOCATOR_DISABLE_STUN)) {
-        // If config has stun_address, use it to get server reflexive candidate
+        // If config has stun_servers, use it to get server reflexive candidate
         // otherwise use first TURN server which supports UDP.
-        if (config_ && !config_->stun_address.IsNil()) {
+        if (config_ && !config_->StunServers().empty()) {
           LOG(LS_INFO) << "AllocationSequence: UDPPort will be handling the "
                        <<  "STUN candidate generation.";
-          port->set_server_addr(config_->stun_address);
+          port->set_server_addresses(config_->StunServers());
         } else if (config_ &&
                    config_->SupportsProtocol(RELAY_TURN, PROTO_UDP)) {
-          port->set_server_addr(config_->GetFirstRelayServerAddress(
+          port->set_server_addresses(config_->GetRelayServerAddresses(
               RELAY_TURN, PROTO_UDP));
           LOG(LS_INFO) << "AllocationSequence: TURN Server address will be "
                        << " used for generating STUN candidate.";
@@ -931,8 +931,8 @@
 
   // If BasicPortAllocatorSession::OnAllocate left STUN ports enabled then we
   // ought to have an address for them here.
-  ASSERT(config_ && !config_->stun_address.IsNil());
-  if (!(config_ && !config_->stun_address.IsNil())) {
+  ASSERT(config_ && !config_->StunServers().empty());
+  if (!(config_ && !config_->StunServers().empty())) {
     LOG(LS_WARNING)
         << "AllocationSequence: No STUN server configured, skipping.";
     return;
@@ -944,7 +944,7 @@
                                 session_->allocator()->min_port(),
                                 session_->allocator()->max_port(),
                                 session_->username(), session_->password(),
-                                config_->stun_address);
+                                config_->StunServers());
   if (port) {
     session_->AddAllocatedPort(port, this, true);
     // Since StunPort is not created using shared socket, |port| will not be
@@ -1115,9 +1115,27 @@
     const talk_base::SocketAddress& stun_address,
     const std::string& username,
     const std::string& password)
-    : stun_address(stun_address),
+    : stun_address(stun_address), username(username), password(password) {
+  if (!stun_address.IsNil())
+    stun_servers.insert(stun_address);
+}
+
+PortConfiguration::PortConfiguration(const ServerAddresses& stun_servers,
+                                     const std::string& username,
+                                     const std::string& password)
+    : stun_servers(stun_servers),
       username(username),
       password(password) {
+  if (!stun_servers.empty())
+    stun_address = *(stun_servers.begin());
+}
+
+ServerAddresses PortConfiguration::StunServers() {
+  if (!stun_address.IsNil() &&
+      stun_servers.find(stun_address) == stun_servers.end()) {
+    stun_servers.insert(stun_address);
+  }
+  return stun_servers;
 }
 
 void PortConfiguration::AddRelay(const RelayServerConfig& config) {
@@ -1146,14 +1164,15 @@
   return false;
 }
 
-talk_base::SocketAddress PortConfiguration::GetFirstRelayServerAddress(
+ServerAddresses PortConfiguration::GetRelayServerAddresses(
     RelayType turn_type, ProtocolType type) const {
+  ServerAddresses servers;
   for (size_t i = 0; i < relays.size(); ++i) {
     if (relays[i].type == turn_type && SupportsProtocol(relays[i], type)) {
-      return relays[i].ports.front().address;
+      servers.insert(relays[i].ports.front().address);
     }
   }
-  return talk_base::SocketAddress();
+  return servers;
 }
 
 }  // namespace cricket
diff --git a/p2p/client/basicportallocator.h b/p2p/client/basicportallocator.h
index 5c43b42..aee6135 100644
--- a/p2p/client/basicportallocator.h
+++ b/p2p/client/basicportallocator.h
@@ -69,9 +69,9 @@
   explicit BasicPortAllocator(talk_base::NetworkManager* network_manager);
   BasicPortAllocator(talk_base::NetworkManager* network_manager,
                      talk_base::PacketSocketFactory* socket_factory,
-                     const talk_base::SocketAddress& stun_server);
+                     const ServerAddresses& stun_servers);
   BasicPortAllocator(talk_base::NetworkManager* network_manager,
-                     const talk_base::SocketAddress& stun_server,
+                     const ServerAddresses& stun_servers,
                      const talk_base::SocketAddress& relay_server_udp,
                      const talk_base::SocketAddress& relay_server_tcp,
                      const talk_base::SocketAddress& relay_server_ssl);
@@ -83,8 +83,8 @@
   // creates its own socket factory.
   talk_base::PacketSocketFactory* socket_factory() { return socket_factory_; }
 
-  const talk_base::SocketAddress& stun_address() const {
-    return stun_address_;
+  const ServerAddresses& stun_servers() const {
+    return stun_servers_;
   }
 
   const std::vector<RelayServerConfig>& relays() const {
@@ -105,7 +105,7 @@
 
   talk_base::NetworkManager* network_manager_;
   talk_base::PacketSocketFactory* socket_factory_;
-  const talk_base::SocketAddress stun_address_;
+  const ServerAddresses stun_servers_;
   std::vector<RelayServerConfig> relays_;
   bool allow_tcp_listen_;
 };
@@ -218,17 +218,27 @@
 
 // Records configuration information useful in creating ports.
 struct PortConfiguration : public talk_base::MessageData {
+  // TODO(jiayl): remove |stun_address| when Chrome is updated.
   talk_base::SocketAddress stun_address;
+  ServerAddresses stun_servers;
   std::string username;
   std::string password;
 
   typedef std::vector<RelayServerConfig> RelayList;
   RelayList relays;
 
+  // TODO(jiayl): remove this ctor when Chrome is updated.
   PortConfiguration(const talk_base::SocketAddress& stun_address,
                     const std::string& username,
                     const std::string& password);
 
+  PortConfiguration(const ServerAddresses& stun_servers,
+                    const std::string& username,
+                    const std::string& password);
+
+  // TODO(jiayl): remove when |stun_address| is removed.
+  ServerAddresses StunServers();
+
   // Adds another relay server, with the given ports and modifier, to the list.
   void AddRelay(const RelayServerConfig& config);
 
@@ -236,9 +246,9 @@
   bool SupportsProtocol(const RelayServerConfig& relay,
                         ProtocolType type) const;
   bool SupportsProtocol(RelayType turn_type, ProtocolType type) const;
-  // Helper method returns the first server address for the matching
-  // RelayType and Protocol type.
-  talk_base::SocketAddress GetFirstRelayServerAddress(
+  // Helper method returns the server addresses for the matching RelayType and
+  // Protocol type.
+  ServerAddresses GetRelayServerAddresses(
       RelayType turn_type, ProtocolType type) const;
 };
 
diff --git a/p2p/client/connectivitychecker.cc b/p2p/client/connectivitychecker.cc
index 1b59943..facb01e 100644
--- a/p2p/client/connectivitychecker.cc
+++ b/p2p/client/connectivitychecker.cc
@@ -288,7 +288,9 @@
     uint32 now = talk_base::Time();
     NicInfo* nic_info = &i->second;
     nic_info->external_address = c.address();
-    nic_info->stun_server_address = static_cast<StunPort*>(port)->server_addr();
+
+    nic_info->stun_server_addresses =
+        static_cast<StunPort*>(port)->server_addresses();
     nic_info->stun.rtt = now - nic_info->stun.start_time_ms;
   } else {
     LOG(LS_ERROR) << "Got stun address for non-existing nic";
@@ -303,7 +305,9 @@
   if (i != nics_.end()) {
     // We have it already, add the new information.
     NicInfo* nic_info = &i->second;
-    nic_info->stun_server_address = static_cast<StunPort*>(port)->server_addr();
+
+    nic_info->stun_server_addresses =
+        static_cast<StunPort*>(port)->server_addresses();
   }
 }
 
@@ -335,7 +339,7 @@
     const PortConfiguration* config, talk_base::Network* network) {
   return StunPort::Create(worker_, socket_factory_.get(),
                           network, network->ip(), 0, 0,
-                          username, password, config->stun_address);
+                          username, password, config->stun_servers);
 }
 
 RelayPort* ConnectivityChecker::CreateRelayPort(
@@ -407,7 +411,9 @@
 void ConnectivityChecker::AllocatePorts() {
   const std::string username = talk_base::CreateRandomString(ICE_UFRAG_LENGTH);
   const std::string password = talk_base::CreateRandomString(ICE_PWD_LENGTH);
-  PortConfiguration config(stun_address_, username, password);
+  ServerAddresses stun_servers;
+  stun_servers.insert(stun_address_);
+  PortConfiguration config(stun_servers, username, password);
   std::vector<talk_base::Network*> networks;
   network_manager_->GetNetworks(&networks);
   if (networks.empty()) {
diff --git a/p2p/client/connectivitychecker.h b/p2p/client/connectivitychecker.h
index 95b736d..3f10c57 100644
--- a/p2p/client/connectivitychecker.h
+++ b/p2p/client/connectivitychecker.h
@@ -96,7 +96,7 @@
   talk_base::IPAddress ip;
   talk_base::ProxyInfo proxy_info;
   talk_base::SocketAddress external_address;
-  talk_base::SocketAddress stun_server_address;
+  ServerAddresses stun_server_addresses;
   talk_base::SocketAddress media_server_address;
   ConnectInfo stun;
   ConnectInfo http;
diff --git a/p2p/client/connectivitychecker_unittest.cc b/p2p/client/connectivitychecker_unittest.cc
index c62120b..8d6fa9d 100644
--- a/p2p/client/connectivitychecker_unittest.cc
+++ b/p2p/client/connectivitychecker_unittest.cc
@@ -66,7 +66,7 @@
                const talk_base::IPAddress& ip,
                int min_port, int max_port,
                const std::string& username, const std::string& password,
-               const talk_base::SocketAddress& server_addr)
+               const ServerAddresses& server_addr)
       : StunPort(thread, factory, network, ip, min_port, max_port,
                  username, password, server_addr) {
   }
@@ -215,7 +215,7 @@
                             network, network->ip(),
                             kMinPort, kMaxPort,
                             username, password,
-                            config->stun_address);
+                            config->stun_servers);
   }
   virtual RelayPort* CreateRelayPort(
       const std::string& username, const std::string& password,
@@ -254,7 +254,8 @@
     EXPECT_EQ(kExternalAddr, info.external_address);
 
     // Verify that the stun server address has been set.
-    EXPECT_EQ(kStunAddr, info.stun_server_address);
+    EXPECT_EQ(1U, info.stun_server_addresses.size());
+    EXPECT_EQ(kStunAddr, *(info.stun_server_addresses.begin()));
 
     // Verify that the media server address has been set. Don't care
     // about port since it is different for different protocols.
diff --git a/p2p/client/httpportallocator.cc b/p2p/client/httpportallocator.cc
index b881d43..1529770 100644
--- a/p2p/client/httpportallocator.cc
+++ b/p2p/client/httpportallocator.cc
@@ -142,7 +142,13 @@
   // but for now is done here and added to the initial config.  Note any later
   // configs will have unresolved stun ips and will be discarded by the
   // AllocationSequence.
-  PortConfiguration* config = new PortConfiguration(stun_hosts_[0],
+  ServerAddresses hosts;
+  for (std::vector<talk_base::SocketAddress>::iterator it = stun_hosts_.begin();
+      it != stun_hosts_.end(); ++it) {
+    hosts.insert(*it);
+  }
+
+  PortConfiguration* config = new PortConfiguration(hosts,
                                                     username(),
                                                     password());
   ConfigReady(config);
@@ -206,7 +212,13 @@
   std::string relay_tcp_port = map["relay.tcp_port"];
   std::string relay_ssltcp_port = map["relay.ssltcp_port"];
 
-  PortConfiguration* config = new PortConfiguration(stun_hosts_[0],
+  ServerAddresses hosts;
+  for (std::vector<talk_base::SocketAddress>::iterator it = stun_hosts_.begin();
+      it != stun_hosts_.end(); ++it) {
+    hosts.insert(*it);
+  }
+
+  PortConfiguration* config = new PortConfiguration(hosts,
                                                     map["username"],
                                                     map["password"]);
 
diff --git a/p2p/client/portallocator_unittest.cc b/p2p/client/portallocator_unittest.cc
index b9def30..760d168 100644
--- a/p2p/client/portallocator_unittest.cc
+++ b/p2p/client/portallocator_unittest.cc
@@ -48,6 +48,7 @@
 #include "talk/p2p/client/basicportallocator.h"
 #include "talk/p2p/client/httpportallocator.h"
 
+using cricket::ServerAddresses;
 using talk_base::SocketAddress;
 using talk_base::Thread;
 
@@ -115,10 +116,13 @@
                       kRelayTcpIntAddr, kRelayTcpExtAddr,
                       kRelaySslTcpIntAddr, kRelaySslTcpExtAddr),
         turn_server_(Thread::Current(), kTurnUdpIntAddr, kTurnUdpExtAddr),
-        allocator_(new cricket::BasicPortAllocator(
-            &network_manager_, kStunAddr,
-            kRelayUdpIntAddr, kRelayTcpIntAddr, kRelaySslTcpIntAddr)),
         candidate_allocation_done_(false) {
+    cricket::ServerAddresses stun_servers;
+    stun_servers.insert(kStunAddr);
+    allocator_.reset(new cricket::BasicPortAllocator(
+        &network_manager_,
+        stun_servers,
+        kRelayUdpIntAddr, kRelayTcpIntAddr, kRelaySslTcpIntAddr));
     allocator_->set_step_delay(cricket::kMinimumStepDelay);
   }
 
@@ -265,7 +269,7 @@
 // Tests that we can init the port allocator and create a session.
 TEST_F(PortAllocatorTest, TestBasic) {
   EXPECT_EQ(&network_manager_, allocator().network_manager());
-  EXPECT_EQ(kStunAddr, allocator().stun_address());
+  EXPECT_EQ(kStunAddr, *allocator().stun_servers().begin());
   ASSERT_EQ(1u, allocator().relays().size());
   EXPECT_EQ(cricket::RELAY_GTURN, allocator().relays()[0].type);
   // Empty relay credentials are used for GTURN.
@@ -696,8 +700,10 @@
   AddInterface(kClientAddr);
   talk_base::scoped_ptr<talk_base::NATServer> nat_server(
       CreateNatServer(kNatAddr, talk_base::NAT_OPEN_CONE));
+  ServerAddresses stun_servers;
+  stun_servers.insert(kStunAddr);
   allocator_.reset(new cricket::BasicPortAllocator(
-      &network_manager_, &nat_socket_factory_, kStunAddr));
+      &network_manager_, &nat_socket_factory_, stun_servers));
   allocator_->set_step_delay(cricket::kMinimumStepDelay);
   allocator_->set_flags(allocator().flags() |
                         cricket::PORTALLOCATOR_ENABLE_SHARED_UFRAG |
@@ -786,8 +792,10 @@
   AddInterface(kClientAddr);
   talk_base::scoped_ptr<talk_base::NATServer> nat_server(
       CreateNatServer(kNatAddr, talk_base::NAT_OPEN_CONE));
+  ServerAddresses stun_servers;
+  stun_servers.insert(kStunAddr);
   allocator_.reset(new cricket::BasicPortAllocator(
-      &network_manager_, &nat_socket_factory_, kStunAddr));
+      &network_manager_, &nat_socket_factory_, stun_servers));
   cricket::RelayServerConfig relay_server(cricket::RELAY_TURN);
   cricket::RelayCredentials credentials(kTurnUsername, kTurnPassword);
   relay_server.credentials = credentials;
@@ -895,6 +903,7 @@
       talk_base::SocketAddress("1.unittest.corp.google.com", 0));
   stun_servers.push_back(
       talk_base::SocketAddress("2.unittest.corp.google.com", 0));
+
   alloc.SetRelayHosts(relay_servers);
   alloc.SetStunHosts(stun_servers);
   EXPECT_EQ(2U, alloc.relay_hosts().size());