CME4 and SIP Trunk

Unanswered Question
May 7th, 2010

Hi all, I have a CME4.0 in cisco 2801 with 4FXO. Now I'm testing a SIP trunk. Our service provider give us another router 2821 with the SIP trunk, username and password already configured. My question is what I need to configure in the CME to make the calls working with the SIP trunk..

I need to configure the dial-peer pointing to the Sip server and the username and password in my router 2801 again?? Thanks for the info, best regards.


PD: The physical connection is:

IP Phone-->switch-->router CME(2801){f0/0}-->{f0/0}router SP(2821)-->SIP PROVIDER

I have this problem too.
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Brandon Buffin Fri, 05/07/2010 - 10:19

You will just need to configure a voip dial peer(s) that point to the 2821. No need to configure the SIP username/password.

Hope this helps.


david-lima Tue, 05/11/2010 - 16:41

Hi Brandon, thanks a lot for your mail. Our SIP Provider told me that no username and password for authentication is required, instead IP authentication is used. Could you tell me if is possible configure a SIP IP authentication in the CallManager Express.

Thanks a lot for your suggestion


Brandon Buffin Wed, 05/12/2010 - 05:56

By IP authentication, they mean that they accept SIP requests based on the IP source address. Shouldn't be anything to configure.

Hope this helps.


david-lima Wed, 05/12/2010 - 08:50

Hi Brandon, thanks for all your help. Please the last question. The SIP service provider give us a public ip address segment, is it necessary to configure NAT?

Thanks Brandon and sorry for this basic questions. Just I want to be sure before continue.

Best regards



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