Version 7.2 751 Mediant 500L Gateway & E-SBC
User's Manual 39. Advanced SBC Features
The basic SIP call flow for INVITEs to and from the registered user is shown below:
To configure support for dual registration:
1. On the SIP entity (IP Phone), configure the primary and secondary proxy server
addresses as the IP address of the device and where each address has a different
SIP port number.
2. Open the SBC General Settings page (Setup menu > Signaling & Media tab > SBC
folder > SBC General Settings), and then from the 'Keep Original User in Register'
drop-down list, select Keep user; add unique identifier as URI parameter.
3. In the Message Manipulations table, configure the following rules:
• Index 0:
♦ Manipulation Set ID: 1
♦ Action Subject: header.contact.url.ac-int
♦ Action Type: Modify
♦ Action Value: '1'
• Index 1:
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