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Cisco Bug: CSCsz92704 - Voice GWs not supporting DSPfarm services should provide warning message

Last Modified

Feb 03, 2015

Products (1)

  • Cisco VG Series Gateways

Known Affected Releases

12.4(20)T3 12.4(22)T1 12.4(24)T 12.4(24.6)T9

Description (partial)

Symptom:
========
IOS Voice GateWay (VGW) platform families like the IAD2430, VG224, VG202, and
VG204 are fixed form-factor VGWs which have C5510 DSPs soldered right onto the
mainboard.  As such they are not expandable to install extra DSP resources and
are meant primarily as TDM-IP devices.  Nonetheless in most IOS releases it is
possible to configure <CmdBold>dsp services dspfarm<noCmdBold> under the <CmdBold>voice-card 0<noCmdBold> CLI in the
running-config as well as to set <CmdBold>dspfarm profile N <conference|transcode><noCmdBold> even 
though transcoding and conferencing services are not supported on these 
platforms.  There simply aren't enough DSPs available to make these DSP services
viable in addition to accomodating regular TDM-IP VoIP calls.  Attempts at 
sustaining a conference or transcoding call fail, and users are confused and 
open up TAC Service Requests.


Conditions:
===========
This behaviour is observed on fixed form-factor IOS Voice GateWay platform 
families like the Cisco IAD2430, VG224, VG202, and VG204, installed with any 
release of IOS.

To clear up the confusion it is proposed that we perform a platform type check
to see whether DSP transcoding and conferencing services are supported or not, 
and if not then we should generate an informational message stating that the 
features are unsupported on the platform.  Something as simple and generic as 
the following would do:

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#voice-card 0
Router(config-voicecard)#dsp services dspfarm ?
  <cr>

Router(config-voicecard)#dsp services dspfarm

% DSPfarm features are not supported on this platform type.

Router(config-voicecard)#
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