Continued multi-endpoint work.

1. Adding telephony disconnet cause for use when a call was pulled.
2. Added helped method to phone number utils which can be used to reformat
a telephony number stored as a SIP URI into a tel URI.

Bug: 27458894
Change-Id: Idef25bbc7b80258b361eb913d4c94b8bb34d7a4a
2 files changed