For outgoing SIP Invites, the process is as follows:
- State Table applications must set any desired SIP headers as tagged
strings in SV541 prior to the call being made.
- A header is generated only if that header is set in SV541.
- The TO_HDR must always be present. (This is the address of the
sip endpoint to which the Invite will be sent.)
- Optionally, the following headers can be added:
- FROM_HDR (default is supplied if not set)
- REQ_HDR (default is supplied)
- DIV_HDR: Diversion header. Also DIV_HDR attributes: reason, counter,
limit, privacy, screen and ext
- A_LANG_HDR: Accept Language
- PRIVACY_HDR: Privacy
- RPARTYID_HDR: Remote Party ID
- PASSID_HDR: P-Asserted_ID