am f4fd88f8: am c7510581: SipService: add log control, suppress ping log.

Merge commit 'f4fd88f8d8cacff718268b6349bcb8c6a28006f3'

* commit 'f4fd88f8d8cacff718268b6349bcb8c6a28006f3':
  SipService: add log control, suppress ping log.