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Verifying the configuration
• When the VCX fails, the local SIP server on Router A starts to accept registrations from phones,
which then can call each other through Router A. Select Voice Management > States and Statistics >
Local Survival Service States from the navigation tree. You can find that numbers 1000 and 5000
have been registered with the local SIP server on Router A.
• When the VCX recovers, Router A disables the local SIP server, and the phones register with the
VCX again.
Configuring call authority control
Network requirements
The numbers for Department A in a company are in the range of 1000 to 1999, while those for
Department B are in the range of 5000 to 5999. The following restrictions need to be implemented:
• Phones in Department A and Department B cannot originate external calls.
• Phone 5000 is not allowed to call phone 1000.
Figure 763 Network diagram
Configuring 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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