Hello, I'm new to trying to setup SIP Phones on a cisco 2921 router that has CME 12.0 I am using Cisco CCP and get the following error messages:
SIP related configuration is missing that will enable the VoIP network to support SIP endpoints.
Configure SIP to SIP Connection and Local SIP Registrar from VOIP Settings.
Also, I will be using a SIP connection from my ITSP vendow
This error indicates that you have to enable sip registar and allow sip to sip connections first.
Connect to your router via CLI (console, telnet, ssh).
And enter commands:
Voice service voip
allow-connections sip to sip
registrar server expires max 3600 min 3600
Bind control source-interface loopback 0 --->here you should specify your interface for media and control messages.
Bing media source-interface loopback 0
You can just use the voice Vlan, without the need of the Data Vlan if the ports on your switch for phone only use.
I believe that the following link provides you the full idea of how you need to configure your CME
Make sure that the "Voice Register Global Parameters Configuration" Section is clear to you.