Keep original phone number in SipConnection.

In case it's a PSTN number carried by an Internet call, the phone app can still
get the original phone number from Connection.getAddress() instead of getting a
SIP URI.

http://b/issue?id=3085996

Change-Id: Ie6c66100a4b5b2ce3f73baa1b446761cd51d7727
2 files changed