Only add maddr to the uri when it is different from the host.

Bug: 3284110
Change-Id: Ib167dab4f37f799f497c787d1bc861539fd900c7
diff --git a/java/gov/nist/javax/sip/clientauthutils/AuthenticationHelperImpl.java b/java/gov/nist/javax/sip/clientauthutils/AuthenticationHelperImpl.java
index c15b569..aa29616 100644
--- a/java/gov/nist/javax/sip/clientauthutils/AuthenticationHelperImpl.java
+++ b/java/gov/nist/javax/sip/clientauthutils/AuthenticationHelperImpl.java
@@ -211,6 +211,9 @@
             if ( challengedRequest.getRouteHeaders() == null ) {
                 Hop hop   = ((SIPClientTransaction) challengedTransaction).getNextHop();
                 SipURI sipUri = (SipURI) reoriginatedRequest.getRequestURI();
+                // BEGIN android-added
+                if ( !hop.getHost().equalsIgnoreCase(sipUri.getHost()) )
+                // END android-added
                 sipUri.setMAddrParam(hop.getHost());
                 if ( hop.getPort() != -1 ) sipUri.setPort(hop.getPort());
             }