Chung-yih Wang d8f3d16735 Add a new phone state ANSWERING.
The state ANSWERING is set when we answer an incoming sip call, i.e.
sending a 'OK' response to the peer. The state will be set to ACTIVE
once the 'ACK' from peer is received.

Change-Id: I84ee3cc68222eb34e032896ce23f7431d4ad774a
2010-09-16 19:09:16 +08:00
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