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Cisco Bug: CSCsy80185 - DTMF detection needs to be disabled during modem passthru

Last Modified

Jan 31, 2017

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


DTMF detection during a modem pass-through call is causing the DSP to be underrun and the jitter buffers to be resized.  This resizing is in turn causing the modems to retrain and data synchronization to be lost during a BERT test.


Modem pass-t hrough with very small jitter buffers set during the voice call, so that buffers while in modem pass-through remain small and cannot handle any delay in the stream.
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