Cisco Bug: CSCvh67030 - ISR4000 series router's NLP and Echo-Canceller suppress DTMF signal in dialing stage
Sep 17, 2019
- Cisco IOS
Known Affected Releases
Symptom: ISR4000 series router's NLP and Echo-Canceller suppress DTMF signal in dialing stage. When ISR4000 series router receives DTMF for dialed digits from calling party, ISR4K will provide dial-tone to calling party. If the input signal level(DTMF) and output signal level(dial-tone) fulfill the requirement of NLP and Echo-Canceller, NLP and Echo-Cancel will suppress DTMF signal so that the call can't be connected correctly. Conditions: NLP or Echo-Canceller is enabled on ISR4000 series router NIM DSP.
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Bug Details Include
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