- generate a RFC 3261 complaint branch ID
cc [ flag ... ] file ... -lsip [ library ... ] #include <sip.h> char *sip_branchid(sip_msg_t sip_msg);
The sip_branchid() function can be used to generate a value for the branch parameter for a VIA header. The returned string is prefixed with z9hG4bK to conform to RFC 3261. If sip_msg is null or sip_msg does not have a VIA header, a random value is generated. Otherwise, the value is generated using the MD5 hash of the VIA, FROM, CALL-ID, CSEQ headers and the URI from the request line. The caller is responsible for freeing the returned string.
The sip_branchid() function returns a string on success and NULL on failure.
The value of errno is not changed by these calls in the event of an error.
See attributes(5) for descriptions of the following attributes: