+ add DATA_CONNECTION_LOST to SipErrorCode + convert it to Connection.DisconnectCause.LOST_SIGNAL in SipPhone http://b/issue?id=2992548 Change-Id: Ie8983c1b81077b21f46304cf60b8e61df1ffd241
+ add DATA_CONNECTION_LOST to SipErrorCode + convert it to Connection.DisconnectCause.LOST_SIGNAL in SipPhone http://b/issue?id=2992548 Change-Id: Ie8983c1b81077b21f46304cf60b8e61df1ffd241