am ae83faa3: am 13f6270e: SipAudioCall: use SipErrorCode instead of string in onError()

Merge commit 'ae83faa3eeb26b1983fb1b8b663eebfe1f1f61d5'

* commit 'ae83faa3eeb26b1983fb1b8b663eebfe1f1f61d5':
  SipAudioCall: use SipErrorCode instead of string in onError()