HP-UX C SIP Stack Message Layer Reference Guide (February 2008)

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The Message API provides access to SIP message content enabling the
application to browse and edit any part of the message. There are API functions
for complete SIP messages and also for message parts such as headers and
URLs.
The Message API is also the interface to the parsers and encoders provided with
the SIP Stack. You can copy, store and re-use messages and message-parts.
This part includes the following sections:
Message Object Functions
Address Functions
Allow Header Functions
Authentication Header Functions
Authorization Header Functions
Contact Header Functions
Content-Disposition Header Functions
Content-Type Header Functions
CSeq Header Functions
Date Header Functions
Expires Header Functions
Other Header Functions
Party Header Functions
RAck Header Functions
Referred-By Header Functions