[cisco-voip] how to load dsp firmware

[Erick Bergquist]

On some modules and DSP models, and IOS versions the DSPWare can be changed by putting special files on the router flash the router looks for but they need to stay on flash to be used. I have personally only seen this sort of fix work once in my experiences where this was needed. The file does need to stay on the flash to be used from my experiences but different hardware/PVDMs may be different.

In the instructions below and in bug id, it states to downgrade to 4.4.12 or earlier , but in the instructions for the verify step it states it should be 4.4.18 version. That doesn't match up.

Did the file get transferred to the router right - it's not corrupt, etc. I would let the engineer know that the special file did not work for you. 

What is your actual echo issue you are experiencing? What version IOS? What type of voice port configuration (echo cancelling commands, input gain, output atten, etc)?  Is there a certain call-flow the echo occurs? Who hears the echo (calling party, called party, both?). Only external calls or do you have it on internal calls also (IP to IP Phone)? Echo can be a very complex thing to fix at times.

----- Original Message ----
From: Matt Slaga (US) <Matt.Slaga at us.didata.com>
To: McLean Pickett <McLean.Pickett at ptgcorp.com>; "Ruttman, Peter G." <PRuttman at foley.com>; cisco-voip at puck.nether.net
Sent: Wednesday, June 7, 2006 3:02:49 PM
Subject: Re: [cisco-voip] how to load dsp firmware

Message       DSPs are not user upgradeable, they must be   replaced.  Open a TAC case referencing your bug ID.and see if they can   replace them.

      From: cisco-voip-bounces at puck.nether.net   [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of McLean   Pickett
Sent: Wednesday, June 07, 2006 11:25 AM
To: Ruttman,   Peter G.; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] how to   load dsp firmware


  
  Pete -
   
  I was given explicit direction not to remove the file from firmware   as the DSP's would revert to the old firmware. 
   
  McLean

      From: cisco-voip-bounces at puck.nether.net   [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ruttman, Peter   G.
Sent: Wednesday, June 07, 2006 10:23 AM
To:   cisco-voip at puck.nether.net
Subject: [cisco-voip] how to load dsp   firmware


  
  TAC says we may be experiencing this   bug:
   
    CSCsd54344: DSP: Persistent echo heard on c5510 DSPs with 4.4.13 DSPware or   higher
  Symptom:
  Under certain circumstances, continual echo may be heard. The echo is   perisitent and the DSP echo canceller does not converge.
   
  Conditions:
  DSPware 4.4.13 or higher on C5510 DSPs are required to experience this   problem.
   
  Workaround:
  Downgrading DSPware to 4.4.12 or earlier resolves the echo issue.
   
  TAC send is firmware and   these instructions:
  INSTRUCTIONS:
  1. Put the file on the flash.
  2. Reload the router.
  3. Verify new DSP version ' sh voice dsp' (should be   4.4.18)
  3. IMPORTANT: Remove file from flash after   verification
   
  However, I did the show voice   dsp and saw no change in the dsp version from before getting the new dsp   firmware.  Can someone tell me if this is the correct way to load firmware   on an NM-HDV2 on a 3745 voice gateway?
  Thanks,
  Pete   Ruttman

    CCNA    CCVP
  Senior Network   Engineer
  Foley & Lardner LLP

   

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