Session and Transaction Management

In the SIP (Session Initiation Protocol) framework, managing sessions and transactions is crucial for the smooth operation of communication services. This section focuses on the SIP header fields that are instrumental in session and transaction management, ensuring that SIP messages are properly sequenced, sessions are correctly established, and communication parameters are negotiated and maintained throughout the session lifecycle.

Record-Route
The Record-Route header is utilized by SIP proxies to ensure that subsequent SIP messages within a dialog follow the same path as the initial request. This header is critical for maintaining the route set for a dialog, especially in complex SIP scenarios involving multiple proxies.
Format Example: Record-Route: <sip:proxy1.example.com;lr>, <sip:proxy2.example.com;lr>