[cisco-voip] One-way Voice Issues

[Weigand, John V.]

Serious Medicine for the Defense R 

It actually has happened on internal calls, including from my co-worker
two cubes down from me. However, a good amount of these are going across
a WAN, and our CCM publisher is at a different site than we're located
at. How would I be able to track down if it's a QOS issue?

 

From: Ted Nugent [mailto:tednugent73 at gmail.com] 
Sent: Tuesday, September 11, 2007 7:59 PM
To: Weigand, John V.
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] One-way Voice Issues

 

Some points to note.

You're really not experiencing a 1 way audio issue. 1 way audio is
typically when the return audio stream is lost in one direction entirely
via a routing issue or similar and you have no audio (dead air) in one
direction. You are however running in a voice quality issue that can be
a pain in the ass to track down. I've run into very similar issues a few
times in the past and it has always turned out to be one of 3 issues.
I'll assume that these are all external calls to or from the PSTN that
are being affected, I can't invision this occurring on an internal call
unless this audio stream was hitting a WAN or VPN link in which case it
could be a QOS issue (or lack of QOS). 

 

1: Bad DSPs on the Voice gateway which explains the intermittent problem
if its only one or a part of a DSP that's bad and is only hit
intermittently 

2: Buggy code on the IOS gateway, there were some really ugly DSP type
bugs in previous code that could be causing this. 

3: PRI issue/provider issue, low signal or similar on the PRI

 

Out of the 3 I'd be leaning towards bad DSPs but any of the 3 will
likely require a TAC case.

 




 

On 9/11/07, Weigand, John V. <jvw at medicineforthedefense.com> wrote: 

	Litigation Management

Serious Medicine for the Defense (r)
<http://www.medicineforthedefense.com/> 

	
	
Our CCM5.x system was installed by our vendor back in February. Since
then, we've had an ongoing one way voice issue. Every so often (mostly
reported by our phone receptionists, but by a few other key users),
they'll either receive or make a call, and be nearly unable to hear the
person on the other end. They can just barely make out their voice, and
adjusting the phone volume does nothing. The person on the other end is
able to hear them with no issue. 

 

We've tried swapping the phones, etc, with no luck. I've had no formal
Callmanager or even VOIP training, but I've been able to pick up a lot,
and administration of the system has fallen to me. I found this document
<http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186
a008009484b.shtml>  about troubleshooting voice issues, and (based on my
very limited knowledge), I'm wondering if it has something to do with
Media Termination Points. Based on what I've read, there's a difference
between configuring those on CCM4 and CCM5, and our vendor really knew
nothing about CCM5, and set it up as if it was CCM4. 

 

Can anyone give me some guidance on how I can learn more about
this/figure it out/any other possible ideas what could be causing it?

 

Thanks so much!

	John V. Weigand
Help Desk Support

Litigation Management Inc. 
300 Allen-Bradley Drive 
Suite 200
Mayfield Heights, OH 44124




Tel: 
Fax: 440-484-2020
Cell: 
email: jvw at medicineforthedefense.com 

	


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John V. Weigand
Help Desk Support

Litigation Management Inc.
300 Allen-Bradley Drive
Suite 200
Mayfield Heights, OH 44124





Tel: 
Fax: 440-484-2020
Cell: 
email: jvw at medicineforthedefense.com 




PRIVILEGE AND CONFIDENTIALITY NOTICE 

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