Cisco Bug: CSCtb26941 - DSP: Echo cancellation tail changes mid-call, echo on single DSP channel
Feb 01, 2017
- Cisco IOS
Known Affected Releases
12.4(11)T 12.4(15)T 12.4(22)T 12.4(25) 12.4(7)
Symptoms: Intermittent echo on voice calls are experienced. All calls through a particular DSP channel will experience echo. Conditions: The symptom is observed when a DSP channel, or set of DSP channels, go into a bad state where they no longer cancel echo. The audio stream coming into the DSP will match exactly what is going out. This can be identified by the symptom that the echo-cancellation tail will vary during a call even when the tail is specified on the voice port. Values from 24ms to 112ms have been observed for a single call which this issue occurs on. The <CmdBold>show call active voice echo-canceller summary<noCmdBold> command can be used to observe the echo cancellation tail, and the voice-port command <CmdBold>echo-cancel coverage<noCmdBold> can be used to statically set the echo cancellation tail.
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