Added CIPID (RFC4482) application

Ignore-this: e63a65b061caeb671aca2f3ea50a2fd3

darcs-hash:20091222145148-56b4d-957571335040036978558a62cf8105f71dcdc3ad
Prevent crash when receiving an INVITE without SDP

Ignore-this: 95de83b3a57ddc76094e809d32f128a0

darcs-hash:20091222155652-56b4d-2a590ea92bb4bb3df4bbbe1d308ecc702ff5bcff