Added threading and dealloc check to recently added properties of PJSIPUA

darcs-hash:20081218130041-58103-145c4967c861730ba2c328e75bed32bd3676b955
im.py: use srv lookup provided by msrplib

darcs-hash:20081218134025-b2873-e83d733e0a5265c28781c2c9f74882d8d3d26e1c