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Cisco Bug: CSCtd29395 - AMR dspware build 9.4.811 leads to DSP crash

Last Modified

Feb 01, 2017

Products (1)

  • Cisco 2800 Series Integrated Services Routers

Known Affected Releases


Description (partial)


Cisco IOS VoIP gateway may experience call drops and no audio intermittently.

Call disconnects or failures due to the following errors 


A Cisco IOS VoIP gateway may experience loss of audio and dropped calls intermittently while process voice calls.  This occurs when the DSP used in the call fails to respond.  

When this occurs, the below error messages may be seen.

This particular issue documented in this bug ID is impacted only in DSP release 9.4.811 as seen in <CmdBold>show voice dsp group all<noCmdBold>

Sep  7 02:09:14.171 PDT: %C5510-1-C5510_CHPI_ERROR: cHPI error for pa_bay 1 pump 1 dsp 9.
Sep  7 02:09:15.555 PDT: %C5510-1-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 1 dsp 9.
Sep  7 02:09:20.555 PDT: %C5510-1-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 1 dsp 9.
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