Thanks in advanced. I am working with a couple of Polycom vtc equipment and are having trouble with calling ISDN. The calls are routed through a Avaya G3siV11. I can call out and in using the ISDN phone option on the polycom but when I call an outside vtc unit it keeps downspeeding and eventually drops off. The same happens when they try to call me if it even goes through. Any suggestions on what I should test. About the only thing I have is butt set to test the line and I do hear a click every 14 seconds.