Moving to sip gateway from H323

Unanswered Question
Oct 28th, 2009

Hi All, I need some opinion on the changing that we plan to make.

We are trying to get a sip trunking and thinking to change our H323 gateways to pure sip gateways. Are there any things that we should be aware of that may affect the performance, feature or functionally of our Cisco phone system.

We are using CUCM 6.1.1.

Any inputs are appreciated.



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Paolo Bevilacqua Wed, 10/28/2009 - 11:19

More than a protocol change that is an architectural change.

Your router will go from simple pstn GWs, to SBC, what cisco calls CUBE.

There are multiple consideration to be done, including possible upgrade and licensing.

To be honest with you, unless SIP trunking gives you a major saving and features, I would stick with PSTN.

sienz.sienz Wed, 10/28/2009 - 11:32

Hi Thank you for your response.

What kind of upgrade and licensing that you mentioned above?

And Can you elaborate what you want to stick with PSTN?

We have multiple site connected via MPLS. We thought that we want to save some money by getting the incoming calls from sip trunking in our main site rather to have PRI in every site and some other considerations

Paolo Bevilacqua Wed, 10/28/2009 - 11:37

Your considerations are right, my recommendation would be to work with a reputable and experience partner, and switch gradually.

However there are many things to consider, one is emergency calls, and what happens if MPLS goes down.

The CM SRND is a good starting document, but again, if you are the end user, I recommend against you try that alone.


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