You ideally need to VLAN your voice and data network, and give each network a different subnet. For example Data 10.1.0.0 and Voice 10.10.0.0.Then if you are using ACL's on your routersfor the Voice traffic:access-list voice permit udp 10.10.0.0 0.0...

Ensure that you have the voice traffic in CoS1 (EF) and signalling in CoS2 (AF). I have encountered this problem before; we changed the CoS and increased the AF bandwidth.

I'm desparatley trying to get a copy of IP Communicator 2.1. Can you send me the link or mail the program. The links I have tried do not work.Thanks in advance

100% faulty cabling problem. I have had this a couple of times before, replaced the cabling and the message did not re-appear.