CME4.1 - PBX Integration

Unanswered Question

We are thinking of using CME4.1 as a gateway to a SIP trunk out (384K).

The questions we have:

Does the connection to the PBX (VWIC) need to be configured as a SIP?

The SIP trunk out is only for connecting the sites (a SIP server by the providor is responsible for connecting with 4 digit outgoing calls), as all local and long distance calls will go out the PBX. This should make the config for the CME4.1 minimal, unless I am mistaken.

Is this all possible? And, if so, would a simple dial plan forward this out ot the cloud?

Thanks! This is a great place to learn!

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Overall Rating: 5 (1 ratings)
Paolo Bevilacqua Fri, 07/18/2008 - 05:33


When you have a VoIP trunk on CME, it will be either SIP or H.323 depending on your preference, note there is no VWIC in this scenario.

When you have a POTS trunk on CME, with VWIC or other voice card, there is no H.323 neither SIP involved.

But, since the description of your scenario is not quite clear to me, you may want to clarify on that.

Paolo Bevilacqua Fri, 07/18/2008 - 05:54

Hi, yes you can do that with or without concurrent CME operation.

Please remember to rate useful posts.

Paolo Bevilacqua Fri, 07/18/2008 - 06:05

Hi, when you have a POTS connection like the VWIC (aka digital trunk), there is never any SIP involved in that.

The signaling on a digital trunk can be ISDN Q931 (Higly Recommended), QSIG, T1 CAS, E1 R2 or even something else, but never anything related to a VoIP protocol like SIP is.

Please rate post if it helps.

Paolo Bevilacqua Fri, 07/18/2008 - 06:17

Well, to begin with you need to know which signaling protocol the PBX uses.

Then, it's also possible that the PBX needs to be configured so that certain calls go via trunk to CME, others go via PSTN possibly.

For a primer on configuring voip and pbx's you can begin searching "understanding dial-peer" on CCO.

The alternative would be to hire a reputable cisco partner or professional that would take care of everything for you.

Ayodeji Okanlawon Fri, 07/18/2008 - 06:41

Paolo, you are my mentor! +5 points for that nice explanation.

Often times people confuse signalling protocls, what they are and where they are used


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