[cisco-voip] UCM <-> Gateway: H323 vs. SIP

[Kris Seraphine]

One thing to keep in mind if you go with SIP is that all calls over a SIP
trunk are presented to CUCM as type Unknown so you lose the
subscriber/national/etc.. information for the call.  This could be an issue
if you want to use calling party transformations based on call-type
information or if you want to prefix digits to the calling number for the
missed calls list.

You can still accomplish the same thing by using ios voice translation
profiles on the gateway of course.

On Sun, Feb 14, 2010 at 4:58 PM, Carter, Bill <bcarter at sentinel.com> wrote:

>
> I am preparing for a UCM 7.1(3) install. The deployment includes Zoom
> CallREC call recording. We will use SPANless recording which utilizes a
> SIP trunk between UCM and Zoom. A majority of the calls will be
> recorded. I am wondering if there are advantages to using SIP from UCM
> to the Gateways. I haven't studied the UCM/SIP integration with gateways
> since studying for the old CCIE Voice with CM 4.1.
>
> I am looking for CCO documents comparing H323 and SIP as it relates to
> UCM features and functionality, and any experiences from the community
> using SIP for the UCM to Voice Gateway connections.
>
> Thanks much
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>
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