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Troubleshooting fading calls

My VoIP calls are fading and dropping. Where should I start to troubleshoot this problem?
The first thing I'd check is the performance of the end-to-end IP service -- primarily packet loss and jitter. If you are experiencing more than 1% packet loss end-to-end or 10msec of jitter end-to-end you're likely to experience problems. Many service providers do not cover packet loss but most do not cover jitter. If you believe your IP network performance (end-to-end) is fine, then I'd check to make sure there aren't any configuration issues or whether there is a newer version of software that may have some fixes.
This was last published in May 2002

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