[cisco-voip] One-way Voice Issues

[Ted Nugent]

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:
>
>    [image: 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_note09186a008009484b.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
>
> PRIVILEGE AND CONFIDENTIALITY NOTICE
>
> The information in this electronic mail is intended for the named
> recipients only. It may contain privileged and confidential material and may
> be protected under law by the Health Insurance Portability and
> Accountability Act. Any use of this information by anyone other than the
> intended receiver is prohibited. If the reader of this message is not the
> intended recipient, you are hereby notified that any dissemination,
> distribution, copying, or other use of this message or its attachments is
> strictly prohibited. If you have received this message in error, please
> notify the sender immediately by replying to this electronic e-mail or by
> calling (800) 778-5424. Please delete it from your computer. Thank you.
>
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://puck.nether.net/pipermail/cisco-voip/attachments/20070911/d15b01de/attachment.html