Disconnect session after 10 seconds if no media is received in sip_audio_session.py and set return code

darcs-hash:20090128195825-58103-5e33e6ea731217007a6b984fd5fd184fcb29282a
Updated TODO

darcs-hash:20090128195926-58103-80531f6041250ce1c2d27feb769a551082b2108a