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one way voice with phones on different clusters

Unanswered Question
Dec 19th, 2011
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I'm running CUCM 7.1.5.  I have two phones that are on different clusters. When I make a call form one phone to the other I have one way voice. I wiresharked the traffic and see the UDP packets received on both of the phones. On the one that has no sound, I see that in the call statistics Rcvr Packets = 0. Although I do see the UDP packets arriving on the PC that I have connected to the PC port off this phone. So it is clearly not a routing issue. What can be causing this?

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Gajanan Pande Mon, 12/19/2011 - 08:06
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is this an issue just with one phone ?

Why dont you try using the latest firmware if the phone in issue does not have it already ?


acampbell Mon, 12/19/2011 - 08:19
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From this link.


Verify Correct Media Termination Point Configuration

If transcoding is configured for an intercluster trunk (ICT), ensure that a Media Termination Point (MTP) is configured in the Media Resource Group and Media Resource Group List associated with the trunk. If you specify an MTP when one is not needed, or fail to configure an MTP if it is needed, it has been known to cause one way voice issues for ICT configurations.

Worth a check




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