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Joined: Oct 2003
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What are some good wire sniffer programs for testing a network for voip system?
Shawn Connect Telecom www.connecttelecom.us In matters of style, swim with the current. In matters of principle, stand like a rock. Thomas Jefferson
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Joined: May 2002
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This topic has a link that may help you.
Retired phone dude
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You should try to find the most common connection which the majority of traffic is passing through; i.e. up-link between the switch and voip system or between the server and switch. Then but a simple "hub" within this connection also plugging in you laptop with the capture software. By doing this you will receive all broadcast messages, since the nature of a hub is simply to repeat every message to every port regards of who the packet is intended. You wont get this by just plugging into an open "switch" port.
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Joined: Aug 2005
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If you're looking to sniff packets, I like ethereal and wireshark. Both are freeware.
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Joined: Mar 2005
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The last I was familiar for testing a converged network with was Chariot, but I'm not sure it's still around.
There are several out there...a couple that come to mind are Tektronix Spectra and Spirent's Abacus.
Neither are cheap...
NCSS NCTS NCTE CS1000E 5.5 CallPilot 5.0
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"If I had known it would turn out like this, I would have become a locksmith"
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Joined: Mar 2005
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If it's not a huge network, you could do a rule of thumb type test by figuring bandwidth availability, network size, what the average ftp usage is by asking the engineers and then calculate bandwidth requirements for the VoIP using G.729 as a benchmark and downloading a free bandwidth calculator.
Regardless what else is going on, you will need QoS capable switches with weighted fair queuing.
NCSS NCTS NCTE CS1000E 5.5 CallPilot 5.0
MITEL 5000 3300 NuPoint
"If I had known it would turn out like this, I would have become a locksmith"
Albert Einstein
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Joined: Jun 2007
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Ping Plotter Pro lets you run simulated Ping/Jitter tests over the wire. That's usually a much better indicator of network conditions and VoIP quality then just bandwidth going out the door. Now don't get me wrong, if the link is saturated then everything dies quickly. But just because you have a big pipe doesn't mean the road is smooth. Just another good tool to have in the arsenal.
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What about good old Wireshark?
KD
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Wireshark and Ethereal just tell you about the data traversing one wire in your network. It wont help you much when you are trying to figure out why your 10-mb internet pipe wont carry 5 VoIP calls from you to California unless your network is trying to send 11-mb over the one wire you have it listening to.
Another good tool for testing VoIP bandwidth needs beyond Ping Plotter is called SIPp. This lets you set a head-end and a remote-end up, and simulate SIP voice trunks between then, allowing you to test jitter, retransmits, loss, latency, etc. This is useful when you want to profile the maximum recommended capacity between two points if you are unsure of the bandwidth/network between them.
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