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

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[RouterC-voice-sip] proxy ipv4 100.1.1.101
[RouterC-voice-sip] register-enable on
[RouterC-voice-sip] quit
[RouterC-voice] quit
# Enable the setting of feature service.
[RouterC] subscriber-line 1/0
[RouterC-subscriber-line1/0] feature permit
After the above configuration, dial feature code *425*1000# at Telephone C, and you can monitor the
conversation between Telephone A and Telephone C. If you want to participate in the conversation, dial
*428# at Telephone C.