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Cisco Bug: CSCus73041 - 3905 Genereated DTMF events are not processed by IVR system

Last Modified

Feb 17, 2018

Products (6)

  • Cisco Unified IP Phone 6900 Series
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 8941
  • Cisco Unified IP Phone 8945
  • Cisco Unified IP Phone 6921

Known Affected Releases


Description (partial)

IVR system does not recognize DTMF events sent by 3905

3905 registered to CUCM accesses a 3rd party IVR system via SIP Trunk.  The user is prompted for a pin number. The pin number is not recognized.  The network capture shows phone transmitting RTP events at 10ms intervals even though  audio packets are being sent at 20ms. This is not RFC compiant
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