am 1257d330: Merge "Clean up pending sessions on incoming call in SipService" into gingerbread

Merge commit '1257d330dcfdb87214278c8fc9718ea9fc663df6' into gingerbread-plus-aosp

* commit '1257d330dcfdb87214278c8fc9718ea9fc663df6':
  Clean up pending sessions on incoming call in SipService