am 852e5354: am 8544560c: SipPhone: fix missing-call DisconnectCause feedback

Merge commit '852e5354f60a0131692c46f509c2e9901b0b6810'

* commit '852e5354f60a0131692c46f509c2e9901b0b6810':
  SipPhone: fix missing-call DisconnectCause feedback