Not able to conferece calls with Cisco Callmanager System version:

Posted on 2013-11-14
Last Modified: 2014-01-13
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
Question by:marceloNYC
  • 3
  • 2
LVL 20

Accepted Solution

José Méndez earned 500 total points
Comment Utility
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.

Author Comment

Comment Utility
This sounds promising.

Let me start working on this.

I will give you an update on this tomorrow.

Thanks a million willlywilburwonka!

Author Comment

Comment Utility
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!

Author Closing Comment

Comment Utility
Thank you!
LVL 20

Expert Comment

by:José Méndez
Comment Utility

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
Skype is a P2P (Peer to Peer) instant messaging and VOIP (Voice over IP) service – as well as a whole lot more.
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now