Set state to ENDED before posting MediaStreamDidEnd in AudioStream

darcs-hash:20090422101821-58103-b4fda0f7ca1a8013bd476c4fc48f0d7ac6357b05
sip_session2: fix error message in :transfer command

darcs-hash:20090422102654-b2873-44375b95a2e99433336f35f1dc7d7be612dc19e4