[*] Garbled Outbound Audio

[Sean Walberg]

What does it mean to check the network and find it in good order?

A few things to watch for:

- FDX/HDX mismatches (which shows up as collisions and runts)
- multicast/broadcast bursts
- queue drops on switches
- stp events

If you're handy with wireshark you can also set it to watch a port and look
for problems in the RTP. Garbled voice is either packet loss, latency, or
phone hardware. Wireshark will show you if it's one of the first two.

Sean

On Mon, Sep 13, 2010 at 10:54 PM, LES.NET (1996) INC. <sales at les.net> wrote:

>  One thing to do, is run MTR or something that does 10 pings per second.
> Monitor the pings in real-time, and when the audio anomaly is occurring,
> see what MTR says for ping times.
> Or better yet, an SNMP octet counter for that interface that is your
> bottleneck (default gateway)
>
> My suspicion is that something is consuming your full bandwidth for a short
> period of time.
>
> Pinging on 1 second intervals would not reveal this..
>
> Les
>
> On 13/09/2010 8:26 PM, Bergen, Mark wrote:
>
>  We have noticed on occasion the outbound audio on our phone system is
> garbled. We have checked the network and it seems to be in good order. It
> happens randomly and usually only for a few seconds (just long enough to
> annoy users). It has also happened when there was only a light load on the
> network.
>
> We configured one of the snom 320 handsets to only use the G711u codec and
> no real change (outbound audio was still garbled a couple of times briefly
> over a 1.5hr phone call). Our system uses VoIP only inside our local
> network, we have an MTS PRI for outbound calls.
>
> Anyone have any ideas or pointers?
>
> Thanks;
>
> Mark
>
>
>
> *Mark Bergen*
>
> *Network Support Analyst*
>
> *ONLINE BUSINESS SYSTEMS***
>
> *Explore | Innovate | Lead*
>
> * *
>
> 200-115 Bannatyne Ave., Winnipeg MB  R3B 0R3**
>
> *mbergen at obsglobal.com* |  Direct Line: 204.982-0218
>
> Office: 204.982.0200  |  Fax: 204.982.0201
>
> www.obsglobal.com
>
>
>
>
> _______________________________________________
> Asterisk mailing listAsterisk at muug.mb.cahttp://www.muug.mb.ca/mailman/listinfo/asterisk
>
>
>
> _______________________________________________
> Asterisk mailing list
> Asterisk at muug.mb.ca
> http://www.muug.mb.ca/mailman/listinfo/asterisk
>
>


-- 
Sean Walberg <sean at ertw.com>    http://ertw.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.muug.mb.ca/pipermail/asterisk/attachments/20100914/456b032b/attachment-0001.html