Wireshark · Wireshark-users: Re: [Wireshark-users] voip troubleshooting

["Bob Carlson" <bob@xxxxxxxxxxxxx>]

I use Ethereal (haven’t upgraded to WireShark yet) for that exact purpose, voip over WiFi. The RTP analysis tool works pretty well as far as I can see.

 

You may find that the default analysis of the packets does not label the RTP packets as RTP. There is a selection that lets you tell Ethl/WS that a particular port pair should be treated as a particular protocol. Just find one packet and designate it as RTP. Then you can use the RTP analysis tool.

 

I often also look at the inter-packet time gaps individually to see what is going on. You may be able to spot one of your unusual delays and see what else is going on on the network.

 

Cheers, Bob

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From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of William Irving Zumwalt
Sent: Saturday, December 09, 2006 7:51 PM
To: frnkblk@xxxxxxxxx
Cc: Community support list for Wireshark
Subject: Re: [Wireshark-users] voip troubleshooting

 

Thank you, this is all helpful.

I just have one question. If I don't know the exact protocol that this particular VoIP software is using, is it safe to say it will be riding on RTP and is there a specific way I need to setup a filter to figure this out? Or how might I go about this?

On 12/9/06, Frank Bulk <frnkblk@xxxxxxxxx > wrote:

Will:

 

Here's a great article to get your started:

http://www.voip-info.org/wiki/view/How+To+Debug+and+Troubleshoot+VOIP

Don't worry if your capture gets your more than just the RTP traffic, unless you're moving Mbps over that wireless link.  Wireshark's RTP stream analysis will automagically select just the RTP streams to analyze.

 

Frank

 

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From: William Irving Zumwalt [mailto:wizumwalt@xxxxxxxxx]
Sent: Saturday, December 09, 2006 2:30 PM
To: frnkblk@xxxxxxxxx; Community support list for Wireshark
Subject: Re: [Wireshark-users] voip troubleshooting

What is jitter? And, is there anything around that might help me configure for capturing only RTP (if I understand correctly, the VoIP protocols ride on top of RTP which rides on top of IP?) and making sense of what's going on?

On 12/9/06, Frank Bulk <frnkblk@xxxxxxxxx> wrote:

Yes Wireshark includes RTP stream analysis including latency and jitter.

 

Frank

 

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From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto: wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of William Irving Zumwalt
Sent: Saturday, December 09, 2006 12:00 AM
To: wireshark-users@xxxxxxxxxxxxx
Subject: [Wireshark-users] voip troubleshooting

Hi all,

I hope I can use wireshark for this task I have.

There's two way voice traffic going on and at one point the IP is sent across radios. The problem is that at some point, the sound comes through delayed, though it always comes through complete. It sounds as if theres buffereing taking place and the voice just stops, then continues. I'm thinking maybe it would be something like one radio is not transmitting strong enough which means some packet ACKnowledgements might not be making it back to the voip source on the TCP network, but I need to see what the packet conversation actually looks like to figure this out.

I was hoping wireshark might be a good tool here to help me troubleshoot what's going on.

Any help, suggestions, comments on what to look for would be greatly appreciated since I haven't yet done this.

Will

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