Guest

Preview Tool

Cisco Bug: CSCtb50309 - C5510 DSP resets when DTMF digit is received and processed on voice port

Last Modified

Feb 13, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(15)T9 12.4(24)T1

Description (partial)

Symptom:
========
While engaged in a VoIP call a C5510 voice DSP resets itself when it detects a
DTMF digit.  Error messages may be similar to:

VoiceRouter#
Jul  6 15:53:31.894: %C5510-1-C5510_CHPI_ERROR: cHPI error for pa_bay 0 pump 0 dsp 9.
Jul  6 15:53:34.910: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
Jul  6 15:53:39.910: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
Jul  6 15:53:44.910: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
Jul  6 15:53:49.343: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/0/0, changed state to Administrative Shutdown
Jul  6 15:53:49.543: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/0/1, changed state to Administrative Shutdown
Jul  6 15:53:49.843: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/1/0, changed state to Administrative Shutdown
Jul  6 15:53:50.143: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
Jul  6 15:53:50.143: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/1/1, changed state to Administrative Shutdown
Jul  6 15:53:53.175: %DSPRM-5-UPDOWN: DSP 1 in slot 0, changed state to up
Jul  6 15:53:53.699: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/0/1, changed state to up
Jul  6 15:53:53.971: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/1/0, changed state to up
Jul  6 15:53:54.123: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/1/1, changed state to up
Jul  6 15:53:54.275: %LINK-3-UPDOWN: Interface Foreign Exchange Office 0/0/0, changed state to up
Jul  6 15:54:17.687: %C5510-1-C5510_CHPI_ERROR: cHPI error for pa_bay 0 pump 0 dsp 9.
Jul  6 15:54:17.691: %C5510-1-C5510_CHPI_ERROR: cHPI error for pa_bay 0 pump 0 dsp 9.
Jul  6 15:54:20.651: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
Jul  6 15:54:25.651: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
Jul  6 15:54:30.651: %C5510-4-NO_RING_DESCRIPTORS: No more ring descriptors available on slot 0 dsp 1.
VoiceRouter#


Conditions:
===========
This behaviour may be observed on a Cisco 2800 Router configured as a Voice 
GateWay to a PBX or the PSTN, installed with PVDM2 DSP cards, and running an IOS
from the 12.4(15)T release onwards in the 12.4T release train.  The condition is
believed to be very rare in frequency, but has been observed on the following 
hardware and software configurations:

(a) Cisco 2801 and Cisco 2811 with VIC2-2FXO voice cards configured for either
    LoopStart or GroundStart signaling,
(b) A single PVDM2-8 DSP card is installed on the Cisco 2800 mainboard,
(c) VoIP signaling is H.323 and DTMF-relay format is h245-alphanumeric,
(d) Transport to a peer H.323 device, in this case Cisco Unity VoiceMail, is
    H.323-aware VRF over a GRE tunnel,
(e) IOS versions 12.4(15)T9 and 12.4(24)T1 have been observed to demonstrate
    the problem.  IOS 12.4(15)T is the first IOS release to support the 
    H.323-aware VRF feature.

These conditions (a)-(e) are not guaranteed to produce a problem, and are only
a description of a particular scenario where the DSP reset has been observed.
Similarly there may be other configurations which may result in a DSP reset when
a DTMF digit is processed by the DSP, which have not yet been identified.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.