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VOIP over Broadband quality issues

We have a few remote broadband sites using VOIP. Some are terminated by a Pix 501 and some are using an 1811. We have been having voice quality issues. About 1/3 of the calls experience clipping and/or distortion. I have QOS configured using policy maps on the 1811 and still am having issues. Is there a good tool to trobleshoot the VOIP? All ping tests seems to be fine but I am looking for a better tool to trobleshoot these issues. We have a combination of Tadiran and Cisco IP phones. I was under the impression the Cisco phones can self correct the jitter using the jitter buffer. Thanks.

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Re: VOIP over Broadband quality issues

As you know, voice quality issues over the internet could be hard to troubleshoot. There are a couple of tools that we use to nail down voice quality issues.

1. NetIQ Vivinet Assessor.

You would need to install the software on a PC at the remote site and also at your central site and you can simulate calls and the report will tell you the delay, drops, jitter etc. This tool does end to end analysis.

Check this link for more details

http://www.netiq.com/products/vd/default.asp

2. Apparanet Networks

This also does call simulation to find out the delay, jitter and drops. The advantage of this tool is that it gives you the hop by hop statistics of jitter, delay and drops at Layer 3. This would be more helpful to isolate the bottleneck.

http://www.apparentnetworks.com/solutions/voip.asp

Regards,

Anup

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