Merge commit 'dc7d73783e0416cbfde6053a037ce32c8f35fbc4' * commit 'dc7d73783e0416cbfde6053a037ce32c8f35fbc4': SIP: implement conference call
Merge commit 'dc7d73783e0416cbfde6053a037ce32c8f35fbc4' * commit 'dc7d73783e0416cbfde6053a037ce32c8f35fbc4': SIP: implement conference call