DSP allocation error

[baskaranm]

Hi,

we are facing incoming/outgoing voice issue some times in one of our location with PSTN calls.

when we check the router we get DSP allocation error. I have attached sh voice dsp group all, sh voice dsp detailed output.

please suggest what is wrong with DSP allocation. and affects calls

Apr  4 16:28:56.958 UTC: %VOICE_IEC-3-GW: VTSP: Internal Error (DSP unknown failure): IEC=1.1.182.9.22.5 on callID 36001 GUID=0A82B36BBB4D11E3AE11A44C115B4380
Apr  4 16:29:06.074 UTC: %FLEXDSPRM-5-OUT_OF_RESOURCES: No dsps found either locally or globally.
Apr  4 16:29:06.074 UTC: %VOICE_IEC-3-GW: VTSP: Internal Error (DSP unknown failure): IEC=1.1.182.9.22.2 on callID -1
Apr  4 16:29:08.326 UTC: %VOICE_IEC-3-GW: VTSP: Internal Error (DSP unknown failure): IEC=1.1.182.9.22.2 on callID -1
Apr  4 16:30:25.905 UTC: %FLEXDSPRM-5-OUT_OF_RESOURCES: No dsps found either locally or globally.

537 DSP resource allocation failure

sh version:

nwk1-rpi-wan-2#                                                                       sh version
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Compiled Tue 26-Feb-13 06:54 by prod_rel_team

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Cisco CISCO3945-CHASSIS (revision 1.0) with C3900-SPE150/K9 with 2031616K/65536K bytes of memory.
Processor board ID FTX1617ALT4
3 Gigabit Ethernet interfaces
24 Serial interfaces
1 terminal line
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DRAM configuration is 72 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
4001760K bytes of ATA System CompactFlash 0 (Read/Write)

License Info:

License UDI:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        C3900-SPE150/K9       FOC16154QP1

Technology Package License Information for Module:'c3900'

-----------------------------------------------------------------
Technology    Technology-package           Technology-package
              Current       Type           Next reboot
------------------------------------------------------------------
ipbase        ipbasek9      Permanent      ipbasek9
security      None          None           None
uc            uck9          Permanent      uck9
data          None          None           None

Configuration register is 0x2102

[Aman Soi]

Hi Aok,

[+5} to you for gr8 explaination.

One doubt which was coming in my mind that can't we use Medium Complexity  instead of Flex since Flex allows oversubscription of DSP resources which introduces the risk of call failure if all resources are used. It accepts a call of any supported codec type.

regds,

aman

[Rajkumar Yadav]

Aman,

Medium complexity consumes more credit compare to Default flex mode to process same call.

Please refer the following doc to get more in depth.

For ex: PVDM2-32 can support 32  G711 calls in flex mode however if you configure in medium or High complex then it support less call as it consumes more credits.

Cisco-router(config-voicecard)#codec complexity ?
  flex    Set codec complexity Flex.  Flex complexity, higher call density.
  high    Set codec complexity high.  High complexity, lower call density.
  medium  Set codec complexity medium.  Mid range complexity and call density.

https://supportforums.cisco.com/document/123126/cisco-pvdm2-and-pvdm3-dsp-creditmips-allocation

I don't have patience like Ayo to explain here.

Ayo,

I have already referred many docs created by you from last 2 months.

You really help in understanding. 

[baskaranm]

Hi,

thanks for this clear explanation. much appreciated.

as we are using medium complexity codec and during oversubscription of DSP ,is there any chances for voice quality affected?

[Ayodeji Okanlawon]

I am not sure if this will lead to voice quality issues, but this will definitely lead to call failures

[Rajkumar Yadav]

Hi,

As i see the complexity configured for the few dsp profile is Medium which consumes more credits to process same call.

please  share sh run for nwk1-rpi-wan-2.

[baskaranm]

Hi Amon.

thanks for your reply.

attached the output you required.