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2. Configure a local number in the local number configuration page: The ID is 5555, the number is
5555, the bound line is line2/1, the user name is 5555, and the password is 5555.
3. Configure a call route to Router A in the call route configuration page: The ID is 1000, the
destination number is 1…, the routing type is SIP, and the SIP routing method is proxy server.
4. Configure SIP registration in the connection properties configuration page: Enable SIP registration,
and configure the main registrar’s IP address as 2.1.1.2.
Verifying the configuration
• Select Voice Management > States and Statistics > Local Survival Service States from the
navigation tree. You can find that numbers 1000, 1111, 5000, and 5000 have been registered with
the local SIP server on Router C.
• The four phones cannot call external numbers, and phone 5000 cannot call phone 1000.
Configuring an area prefix
Network requirements
The internal numbers of a company are four-digit long and the area prefix is 8899. An external user
needs to dial the area prefix 8899 before an internal number. The local SIP server on Router C removes
the area prefix from the dialed number and calls the four-digit internal number. The external phone
attached to Router A is not registered with Router C. The internal phone attached to Router B is registers
with Router C.
Figure 770 Network diagram
Configure the local SIP server on Router C
# Configure the local SIP server to operate in alone mode.
1. Select Voice Management > SIP Local Survival > Service Configuration from the navigation tree to
access the following page.
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