cc [ flag ... ] file ... –lsip [ library ... ] #include <sip.h> int sip_add_header(sip_msg_t sip_msg, char *header_string);
The sip_add_header() function takes the SIP header header_string, adds a CRLF (carriage return/line feed) and appends it to the SIP message sip_msg. The sip_add_header () function is typically used when adding a SIP header with multiple values.
The sip_add_header() function returns 0 on success and the appropriate error value on failure.
On failure, the sip_add_header() function can return one of the following error values:
Mandatory parameters are not provided, i.e. null.
The message cannot be modified.
Error allocating memory for creating headers/parameters.
See attributes(5) for descriptions of the following attributes:
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