Added message summary application (RFC3842)

Ignore-this: 6279aed6c0e5f67a5a62172d8c85358f

darcs-hash:20091231105736-56b4d-c36d4c50bd19671bcd3796ee5685a72b2a2dc253
Pass code and reason of SIP MESSAGE response to its notification

darcs-hash:20091231165759-58252-dd0462204fc5dca9a0f47f3e7efab98c6e4b7269