I'm not sure if this is a problem with our polycom 501 phones or with a setting in asterisk..... When you set the "forward" option on the phone and have it point to an outside number (a cell phone) we see the following problem... The call does forward, but while its doing so and while its ringing, you hear this irritating loud pulsing sound. When we call from a non-polycom phone and dial into the phone with the forward, this noise isn't there. I couldn't find a polycom mailing list, otherwise I'd try this question in there as well. Has anyone ever seen a problem like this? Rob