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Cisco Bug: CSCtf14540 - MGCP calls fail with 510 fx: setting cannot be supported

Last Modified

Aug 22, 2017

Products (1)

  • Cisco 3800 Series Integrated Services Routers

Known Affected Releases


Description (partial)

Voice calls fail when call manager sends a CRCX with fxr/fx:t38.  Gateway running 12.4(25)b is rejecting the crcx with 510 fx: setting cannot be supported

When fax relay is enabled on call manager you can not have the default mgcp package be FXR and then disable T38
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