R2511-HP MSR Router Series Voice Configuration Guide(V5)

188
Phone 1000 and Phone 5000 have already registered with the local SIP server, Router C, which
periodically sends Options messages to VCX to detect the link reachability. If the link is
unreachable, the local SIP server accepts registrations and calls originated by Phone 1000 and
Phone 5000. If the link is reachable, the local SIP server rejects registrations and calls, and Phone
1000 and Phone 5000 then register with VCX, which accepts their registrations and calls.
If the link between Router C and VCX is disconnected, Phone 1000 and Phone 5000 can register
with the local SIP server again to originate calls.
Configuring the local SIP server to operate in the alive mode
(method 2)
Network requirements
Router A and Router B carry out call services through the VCX. Configure Router A to operate in the local
SIP server alive mode. When the IP link between Router A and VCX fails, the local SIP server on Router
A accepts registrations from its attached phones to make sure the phones can initiate and receive calls
through Router A. When the IP link between Router A and VCX recovers, the local SIP server on Router
A is disabled, and the attached phones re-register with the VCX. See Figure 54.
Figure 54 Network diagram
Configuration procedure
1. Configure Router A:
# Configure the Ethernet interface.
<RouterA> system-view
[RouterA] interface ethernet 1/1
[RouterA-Ethernet1/1] ip address 1.1.1.2 255.255.255.0
[RouterA-Ethernet1/1] ip address 2.1.1.2 255.255.255.0 sub
[RouterA-Ethernet1/1] quit
# Configure the router to operate in the alive mode.
[RouterA] voice-setup
[RouterA-voice] sip-server
[RouterA-voice-server] server-bind ipv4 2.1.1.2
[RouterA-voice-server] mode alive-server
[RouterA-voice-server] probe remote-server ipv4 3.1.1.1
[RouterA-voice-server] server enable
# Configure number registration information for the phones.
[RouterA-voice-server] register-user 1000