SIP subscribe notify publish forwarding

TSBC can forward SIP Subscribe, Notify and Publish messages between users and registrars (PBX).
Forwarding of these messages follow the same rules as forwarding of SIP registration.

SIP Subscribe overview

The SIP SUBSCRIBE method allows users to subscribe to various services, and get notified of events related to these services. Typical services (packages) that phones will register to are:

• Voice mail
• Presence
• Conference

Each user's device can register to various packages, then receive notifications for each of these package (independently).
TSBC will forward these Subscribe requests from users to Registrar (PBX), and Notify events from Registrar (PBX) to users.

References

• Understanding SIP Subscribe
• IANA SIP Event types