Transfer and Connect: DTMF Tones not Recognized

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DTMF Tones not Recognized

Problem Summary Dual-Tone Multi-Frequency (DTMF) tones are not recognized.
Error Message None
Possible Cause If using ASR, and the caller is coming from the PSTN, the gateway dial-peers may be incorrectly configured.
Recommended Action Possible Solution: In Unified CVP, there are two VoIP dial-peers involved in the call: One to go from the gateway to the Unified CVP H.323 Service and one to go from the Unified CVP H.323 Service to the IVR gateway.

Each of these dial-peers must have the following attributes to be recognizabled correctly by DTMF:

  • dial-peer voice 800 voip
  • destination-pattern 8.........
  • session target ipv4:10.64.228.100
  • dtmf-relay rtp-nte h245-signal h245-alphanumeric
  • codec g711ulaw no vad
Release Release 7.0(2)
Associated CDETS # None.
Possible Cause If using Scansoft ASR, the DTMF payload type is incorrectly configured in Scansoft.
Recommended Action In Scansoft config file C:\Program Files\ScanSoft\SpeechWorks OpenSpeech Media Server\Server\config\OssServer.cfg, change the following value from 96 to 101: server.transport.dtmfPayloadType VXIInteger 101
Release Release 7.0(2)
Associated CDETS # None.

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