Fixed re-INVITE handling in AudioStream when ICE is used

Ignore-this: ab4982da98d2a9b446e66fdcd76578f0

darcs-hash:20100312193020-1e3d8-8eb1e1157e731c53607618885ef42aa5926decdd
Improved notification names

darcs-hash:20100313103517-58252-00f08924670bb1ab944f217b11ed4060341b6a08