Software Conference

Posted: June 17, 2006 by cciestudy in Media Resources

As per this link 
Software conference devices only support G.711 codecs. Cisco CallManager 4.0 and later also support G.729 codecs. Still, the default codec is G.711. However, if the Meet-Me conference is initiated by a phone that has a G.711 codec, G.729 devices are not able to join the meeting unless there is a transcoder involved. A transcoder is needed to handle the translation from one codec to the other one. A similar issue arises with Ad-Hoc conferences. If the phone that initiates the conference tries to include a phone with a different codec, it fails. An error message is displayed on the traces. Hardware conference devices can provide transcoding for G.711, G.729, and G.723 codecs.

This did not work in the lab. After changing the region to use G729 and trying to do a conference, getting a fast busy. Also event viewer is reporting the error

Error: MtpNoMoreResourcesAvailable – No more MTP resources available.
App ID: Cisco CallManager
Cluster ID: StandAloneCluster
Node ID:

  1. Ted Nugent says:

    Yep… have never gotten it to work and SW cfb will always be picked first over a HW CFB in the same MRG. Do yourself a favor and delete the SW CFB or put them in an unsed MRG.

  2. Yohay says:

    I have the same problem In CCM 6. I use the G.729 Region and when initiating a conference I get a fast bussy. (when changes to G.711 all is fine) does it meen I need a trascoder for that?

  3. john says:


    May be you can use G.729a / g.729b for transcoding. for better understanding about it you can look at speech codecs pros cons

  4. Jack says:

    I just tried with the Personal Communicator after changing it to G711u. It did not work. I had to uncheck the Optimize Voice Quality check box to get it to work.

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