calls get disconnected when press conference.

[eddchen]

Hi guys,

We have users recently report unable to conference calls when external calls are involved. Behaves as below:

1.  able to call external party 1 then select conf , and call exteral party 2, when press the conf soft key, it will disconnect both calls.

2. external party 1 calls in cisco phone, then select conf , and call exteral party 2, when press the conf soft key, it will disconnect both party 2, but party 1 stays.

did a trace and picked up some error with transcoding, we are using all the cucm based sw xcode resource, can any confirm it is really xcoding issue, (not really confident with my log reading skill in cucm), if yes, what would be the next step to proceed? Thanks guys.

test calls are made from mobile 00424166368 and 00293727443, cisco extension is 9228 3176, time is around 12:55pm. ciscp phone mac is

SEPB41489A3DB42

Ed

[Aaron Harrison]

Hi Ed

I'd recommend that you review your MRG/MRGL configuration. In general I would:

- Ensure that all media resources (conf bridges/transcoders being the key ones in this example) are in the correct device pool - i.e. one with appropriate settings for where that device is placed in your topology

- Add each type of media resource at each site to a unique MRG

- Build an MRGL for each site containing the MRGs that it should use

It sounds to me like an inappropriate resource (e.g. a transcoder from an incorrect site for example) is being invoked and failing.... possibly due to regions/locations limitations or some such.

If you have the bandwidth, a quick fix might be to put the confi bridges in their own new device pool with a new region, and configure that region to run G711 to everywhere.

Aaron

[Ayodeji Okanlawon · Accepted solution]

Here is what is going on..

+++CUCM selects this device for the conference...+++

12:55:21.293 |UnicastBridgeControl::allocateStream - Device Name=CFB_DIRPUB

++Next CUCM does a capabilites check between the the phone and CFB, we see that the region is set to use G729/8kbps+++

12:55:21.295 |DET-MediaManager-(2081045)::preCheckCapabilities, region1=Hub_None, region2=OIR_McKellHO

  12:55:21.295 |RegionsServer::MatchCapabilities -- kbps=8, capACount=11, capBCount=3|*^*^*

++However the CFB cant support G729..Looks like this is a software CFB, CUCM then tries to invoke a XCODER++

12:55:21.295 |DET-MEDIAMANAGER-(2081045)::PRECHECKCAPABILITIES, CAPS MISMATCH! XCODER REQD. KBPS(8

+++ The only device in the MRG in the CFB is this MTP+++

MRM::GETXCODEDEVICEGIVENMRGL DEVICENAME=MTPC89C1D87CF00

++Next CUCM reports an error and drops the call+++

12:55:21.296 |MRM::waiting_AllocateMtpResourceErr - ERROR - no resources are available

Solution.............

SW conference bridge cant support G729, so you either need to set the region between the phones and the CFB to use G711, you also need to set the region between the gateway and CFB to use G711.

Or

Configure a hardware CFB on your gateway..

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