+ add DATA_CONNECTION_LOST to SipErrorCode + convert it to Connection.DisconnectCause.LOST_SIGNAL in SipPhone http://b/issue?id=2992548 Change-Id: Ie8983c1b81077b21f46304cf60b8e61df1ffd241
http://b/issue?id=2984419 http://b/issue?id=2991065 Change-Id: I2d3b1dd3a70079ff347f7256f4684aea07847f4e
Change-Id: I8b071d4933479b780a403d0bfa30511f4c23ca8f