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Cisco Bug: CSCuq45168 - Off-ramp GW is not generating CNG tone

Last Modified

Mar 09, 2015

Products (1)

  • Cisco 2900 Series Integrated Services Routers

Known Affected Releases

15.1(2.12)

Description (partial)

Symptom:
Off-ramp GW is not generating CNG tone.

Call flow:
Mail----SMTP----VG----T37 Off-ramp-------PRI-----PSTN---------Cisco GW(fax detect)

In the above scenario, the called side need CNG tone from calling side to route the call to a fax destination. When the Fax is initiated from Cisco Off-ramp GW, the fax detect application is failing as there is no CNG tone coming from the off-ramp GW. 
The strange thing here is that the Off-ramp GW is generating CNG tone if we enable debugs (any one of debug voip hpi all, debug voip dspapi all and debug voip dsmp all?) and make the fax calls.

Conditions:
if we do not enable debugs (any one of debug voip hpi all, debug voip dspapi all and debug voip dsmp all).
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