Restrict Extension Registration Based on User Agent
This section describes how to restrict extension registration based on user agents.
Background Information
SIP is a peer-to-peer protocol. The peers in each session are called User Agents (UAs).
User Agent Client (UAC)
Initiates a SIP request
User Agent Server (UAS)
Responds to the request back to the UAC
Procedure
Follow these steps to restrict registration:
1
Log in to the IZT Cloud PBX web portal, go to Extension and Trunk > Extension, edit the desired extension.
2
Click the Security tab.
3
In the SIP Security section, check the checkbox for Enable User Agent Registration Authorization.
4
Click Save and Apply.
Result
Registration Requirement
When a phone tries to register, it needs to send SIP packets containing a user agent.