Fast Busy During Intercluster Call

Unanswered Question

Here is the breakdown:

  • We are running CallManager 4.3(2)
  • We have multiple clusters connected to a gatekeeper using H225 Gatekeeper controlled trunks.
  • Calls between clusters are working fine except for one group of phones
    • These phones are remote site to the cluster (Clsuter A) and are statically configured to point to the CallManager Cluster
    • Calls from any other cluster to the phones that are sitting locally with Clusuter A work fine
    • When calls are made to the phones that are at the remote site the phone will ring but will go to fast busy upon answering.
    • Calls from the remote site to phones on Cluster A  work fine
    • Calls from the remote site to phones in other clusters result in ringing then a fast busy upon answer=

Any ideas?



I have this problem too.
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JustForVoice_2 Sat, 05/22/2010 - 01:02

It seems MTP or Transcoding problem , troubleshoot the Media resources, media resources groups and region configuration.

Abu Hadee Sat, 05/22/2010 - 03:01


It's codec issue. Codec is negotiated after the call is answered. And that is why call is getting disconnected.

You need to check the region setting

Check the Device Pool and Region of the GK Trunk

Check the Device Pool and Region of the Remore Phone

What codec is configured between them? Same thing needs to be done on the other cluster who  is making call.

If you make the remote phone same device as the Local Phone on Cluster A, it should work.


- Abu


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