Siemens HiPath h323 trunking with CUCM

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Feb 11th, 2009
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Has anyone integrated a Siemens HiPath PBX via H323 to CUCM? If so, what issues did you have? I know that I can do the integration with QSig & standard PRI's, but would like to utilize the IP Trunking features if possible.

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Hi Kelvin

We have implemented an IP trunk between a Siemens and a CUCM. We had the following issues:

- The Siemens did not want to establish calls unless we used G711.

- The Names and additional information that can be exchange between the PABX so the caller name can be seen is not working.

- When calls are made from the PABX to Cisco IP phones and transfered the voice sometimes becomes garbled.

Other than these we did not have any other issues.

sameh.hasan Mon, 04/06/2009 - 23:21
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WOULD U PLEASE TELL ME THE PART NO OF PRI interface for cisco router ( is it HWIC-1CE1T1-PRI) please confirm .


Sameh Hasan

Sushil Kumar Katre Tue, 04/07/2009 - 04:21
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Hi Sameh,

The module you are referring supports Data PRI only. It does not supports Voice.

You need to have VWIC2-1MFT-T1/E1 (1 port) or VWIC2-2MFT-T1/E1 (2 port) module for this kind of integration.

-> Sushil

mightyking Tue, 04/07/2009 - 05:59
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I don't remember the exact modle and version of the Siemens PBX but I remember I did a Semines-CUCM integration few years ago. I used an H.323 trunk btw PBX and CUCM.

First of all, you need to make sure if the PBX supports H.323 trunk. Each call from PBX to CUCM requires two H.323 trunks, so make sure you have enough H.323 trunks available. You need to make sure the PBX has at least one Media Processor card installed. This card will take care of codec conversion. Also make sure to select "a" as the vlue for codeset in the PBX tunk-group configuration page. CUCM only understands "a" codeset. The codeset will take care of user Name/Number transmission.


sameh.hasan Tue, 04/07/2009 - 06:30
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hi all

please i need your help in my case , my customer has a PBX ( simenz) and he want to make voice mail .i thing in router 2811 with NM ( CUE) , so my question does this router with CUE module will integrate with Siemens PBX .

i found in cisco site that is will be ok , but i should have a pri trunk then i chhosed the interface VWIC2-1MFT-T1/E1

to act as pri trunk between cme and PBX .

is this solution right or .... ???

please anyone confirm .


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