Calling name doesn't appear between CUCM and PBX

Unanswered Question
Mar 16th, 2009

I am connecting CUCM 6.1 to Teltronics PBX 2020 via Cisco 2800 gateway with E1 ETSI PRI

I configure the 2821 gateway as Primary-Net5 ISDN Switch type

Calls between PBX and CUCM are ok but calling name doesn't appear

When the digital phone call ip phone, I tried to debug isdn q931 and i can see the calling name in the debug

Locking Shift to Codeset 7

Codeset 7 IE 0x28 i = 0x01, 'I.GHALAYIN', 0x00000000000000000000

Anyone can help me ?



I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
moabdallah Mon, 03/16/2009 - 16:12

Debug output show that PBX is sending the calling name to the voice gateway

But calling name doesn't appear on the IP phones !

Nicholas Matthews Mon, 03/16/2009 - 21:21


I don't believe that CUCM supports this codeset. See if the PBX can use codeset 6 instead, and this should work.


Paolo Bevilacqua Mon, 03/16/2009 - 23:56

Are you using H.323 or MGCP ? If you see the name in debug output, the router is able to decode it.

Nicholas Matthews Tue, 03/17/2009 - 05:44

This is what I mean by codeset:

Locking Shift to Codeset 7

Codeset 7 IE 0x28 i = 0x01, 'I.GHALAYIN', 0x00000000000000000000

Here, it's Codeset 7.

Because the ISDN stack on the router recognizes it doesn't necessarily mean that the ISDN stack on CUCM is able to decode this. The 'debug isdn q931' is decoded with the router's ISDN stack, so it will possibly decode things the CUCM stack will not. It's also very possible that CUCM knows what it's looking at, but it just not supported.



Nicholas Matthews Tue, 03/17/2009 - 21:04

I would try that as your first step. If you can't ask the other side to try configuring another codeset, your options become fairly limited.

Since your gateway appears to recognize this, you can try checking to see if we'll send this information to CUCM. You can also try SIP, as it's very similar to H323 but sometimes you'll see slightly different feature sets on corner cases like this.



moabdallah Wed, 03/18/2009 - 07:28

First, I will try to ask the PBX team to adjust its configuration

Which parameters should they configure on the PBX ?

Should I ask the PBX team to configure the Codeset with 6 ? please confirm

Will they understand the "codeset" ? OR it has another name in teleco/PBX world ?

moabdallah Mon, 04/06/2009 - 08:10

PBX Engineer told me they don't have CodeSet parameter !!!

These are the facility parameter on the PBX

Facility number .............. 21

Trunk group number (PRI) ..... 21

Outgoing COS number .......... 20

Element....................... SNAM

Element....................... SCDN

Number Type............... NATIONAL

Numbering Plan............ ISDN

Digits.................... SDIGITS 10

Element....................... SCLN

Presentation Restriction

Indicator .............. ALLOWED

Number Type............... NATIONAL

Numbering Plan............ PRIVATE

Digits.................... SANI 4

moabdallah Tue, 03/17/2009 - 10:07

I configured the 2821 router with MGCP configuration

I can see the calling name in the debug output but it seems the router can't understand it !!

Paolo Bevilacqua Tue, 03/17/2009 - 10:17

With MGCP, the router does not have any intelligence. All the message processing is done on the CM.

If you use H.323 or SIP, the router does all the processing and you would be able to see the calling name.

mightyking Wed, 03/18/2009 - 08:02

The only codeset the CUCM understand is "0". Have the PBX team to set the codeset to "0". This feature is configured in the PBX Trunk-Group configuration page. Also, if the PBX supports Supplementary Services, set the Supplementary Service Protocol to "a"


moabdallah Mon, 04/06/2009 - 08:01

PBX Engineer told me they don't have paramter called "CodeSet " !!!


This Discussion