P-Visited-Network-ID Header

The Oracle Communications Unified Session Manager's IMS support also includes the insertion of a P-Visited-Network-ID header into SIP messages when applicable. When a UE sends a dialog-initiating request (e.g., REGISTER or INVITE message) or a standalone request outside of a dialog (e.g., OPTIONS) to the Oracle Communications Unified Session Manager, it inserts the P-Visited-Network-ID header into the SIP message as it enters into the destination network.

The P-Visited-Network ID header will be stripped from SIP messages forwarded into untrusted networks as expected. The content of a P-Visited-Network-ID header is a text string that identifies the originating UE's home network. This string is user-configurable.