Fixed ending of invite session when initial SDP negotiation fails

Ignore-this: 63a268af18bb676eee01146fff688c60

darcs-hash:20091230131007-1e3d8-03f9701739c5c3d8892b9c92a3f420bdb3108e38
Increased core revision for force recompile

Ignore-this: 50bf4cf9b3d8fd469268361a4412a4d6

darcs-hash:20091230162303-1e3d8-c087cf5bfb43a806d75908fc38951c250a88ff79