Not able to conferece calls with Cisco Callmanager System version:

Dear Experts:

This is not going to be easy to explain.

Our users at our main office location are not able to complete a conference call. Once you try to conference it hangs up.

I am at a different office using the same Cisco Callmanager over dedicated connection and I am able to connect conference calls.

So there has to be something going on in our main office settings (partition) that I can't find or do not know where to look.  I am trying to compare and I am not able to determine the cause of the problem.  

I did some work on the templates of one user and it allow me to make conference calls internally only (only him). That user is like the rest still cannot make conference calls with external numbers. The rest of the users are not able to make internal conference calls either.

All helpful comments are appreciated.

Regards, M
marceloNYCMiddle-Tier AdministratorAsked:
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José MéndezConnect With a Mentor Commented:
Choose 3 IP phones that you know cannot be on a conference call simultaneously at this point.

Choose one and name it your conference initiator.  Try to establish the ad hoc conference from it.

Review the MRGL associated to that phone.

Review the MRGs inside the MRGL.

Identify the Conference bridge(s) within the first MRG, top to bottom.

Now, both a phone and a conference bridge are linked to a device pool, which in time contains a region. Write down the Region associated through the Device Pool field, to each phone and also the one associated to the conf bridge.

Go to System > Region and click on one of the regions associated to one of the IP Phones. Make sure that the Region of each phone is configured to speak G711 toward the region of the conference bridge.

If the region relationship is not showing up, it is not configured. For example, if you open RegionA and do not see a specific configuration for RegionA to Region B, then it is not configured, and the system uses teh default inter-region value which is G729. Callmanager based bridges do not support G.729, only G711.

Once you fix the region relationship between each of the 3 phones you started with, against the region of the conference bridge, you should be able to establish the call.
marceloNYCMiddle-Tier AdministratorAuthor Commented:
This sounds promising.

Let me start working on this.

I will give you an update on this tomorrow.

Thanks a million willlywilburwonka!
marceloNYCMiddle-Tier AdministratorAuthor Commented:
Sorry is taking me so long. There has been some distraction and no help on the trouble site to test the phone conferencing. I am going to work this week on this. Thank you!
marceloNYCMiddle-Tier AdministratorAuthor Commented:
Thank you!
José MéndezCommented:
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