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Cisco Bug: CSCuq89026 - DTMF tone not recognized when the output attenuated over default

Last Modified

Mar 09, 2018

Products (1)

  • Cisco 2800 Series Integrated Services Routers

Known Affected Releases

n/a

Description (partial)

Symptom:
For outbound DTMF, DTMF is not recognized properly with any types of carrier.
CUCM -> SIP VGW : OK for DTMF 
SIP VGW -> : Not work for DTMF 
DTMF signaling method RFC2833

Conditions:
Output attenuation set to 9 rather than 3(default).
1. Debug voip hpi all; 2. Pcm capture
The symptom showed  151-4.M5 thru 151-4.M8(Customer use).
but the symptom was not shown 151-4M thru 151-4M4
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