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poor video conferencing quality

Last Modified: 2012-06-21
We have a polycom vx700 unit we use for video conferencing to a single remote location. My company wants "perfect" videoconferencing. We get good video most of the time but the video fades and breaks up during the transmission. We have a T1 line for internet connectivity and are using 512 for the video conferencing. The polycom is attached thru our Cisco 3560 VoIP switch to a Cisco 2800 router. The polycom unit is assigned a public address. I have a couple of questions.

Why would the polycom unit be passed thru the switch to the router instead of directly to the router?

Why would the router connection for the polycom not be in a DMZ?

I have years of experience with networks, routers and switches but I am a complete nubee to video conferencing.  I do not have the problem with the video except when connecting to our Vancouver site. The Vancouver site only has problems with the video when they are connected to us.

I would also be interested in any suggestion of how to get better video conferencing quality.
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I have not been able to  monitor the Vancouver site. However the remote site can establish a video conference with other locations with out poor quality video. While monitoring my own site the only problem I can find is the fluctuation in the bandwidth from my laptop to the Polycom. No report of lost packets or delay just the fluctuation of bandwidth. Running the same test  to Vancouver I do not get the fluctuation in bandwidth.

I have checked the H232 duplexing at both ends of the connection on the polycom units and everything is OK. Both locations are using 512 bandwidth. The polycom units at both ends are using 100 MB connections. The switch ports are set to auto negotiate both duplex and speed.

I just received a new switch to expand our network and thought about moving the polycom connection directly to the router port or to the new switch. I am wondering if the load on the old switch might be the problem. The setup we are using now has been working without a problem for about a year prievious to the current problem. The tools I am using (whats up gold) do not give me values for the jitter of a connection or I have not figured out how to measure it..
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