not possible to make conference when Built In Bridge is enabled

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Mar 29th, 2010
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Hello everybody,

I enabled Built In Bridge because we use Nice Recording, recording work fine but we can not make conference, thanks to help me to fix this problem,


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Overall Rating: 5 (4 ratings)
Jaime Valencia Mon, 03/29/2010 - 07:51
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You don't use the built-in bridge for ad-hoc or meet-me, that config is not related.

Check you have a CFB available in the phones MRGL and, if the CUCM SW CFB, that you're using G711



If this helps, please rate

David Hailey Mon, 03/29/2010 - 07:54
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Java is correct.  The built-in bridge functionality is used for the Barge feature.


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mohamedessoufy Mon, 03/29/2010 - 08:04
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in advance thank you for you answer,

but when just i disable the built-in bridge the conference work fine ?!!!



robluechtefeld Tue, 03/30/2010 - 14:34
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I had this problem the other day.  The issue is a recorded line in combination with the G.722 codec.  In my situation, when a station to station call was placed, the phones negotiated to use the G.722 codec.  You can verify this by calling another voip phone and press the ? button twice.  Normally, if a phone is using G.722 and is added to a conference, it will renegotiate to G.711 or some other supported codec.  However, on a recorded line this renegotiation doesn't happen.  Therefore, the call gets dropped because of the unsupported codec.

To resolve this problem you need to go into System -> Service Parameters  and select the Cisco CallManager Service.  Under "Clusterwide Parameters (System - Location and Region)" set the value for "G.722 Codec Enabled" to "Enabled for All Devices Except Recording Enabled Devices"

Hope this helps


Aaron Harrison Wed, 03/31/2010 - 01:21
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Good tip (+5)

akouki1971 Fri, 01/28/2011 - 01:11
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I have exactly same issue.

I think that would be a good suggestion.

I will give it a try, and I will update you.



dijohn Fri, 01/28/2011 - 09:04
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This is why you ran into that problem

The BiB (built in bridge) supports other codecs too, but be aware that it will do codec locking. This means if phone A is on a call with phone B using g711, and the region between phone B (who has recording enabled with the BiB) and the SIP trunk to the recording server is g729,recording will need to invoke a transcoder since the phone will only send out g711 which matches the original call codec. If the recorded phone was using g729 for the RTP stream between phones, the BiB can only send g729 out.


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