I am trying Verizon VOIP. The equipment they provide is a Linksys PAP2 phone adapter in my case with 2 lines. I am attempting to use this through my business network which consists of a Netopia Cayman router and a Netgear hub. The 3CX PBX resides on our Microsoft 2003 Small Business Server and is conncected to the hub. I also have a IP Dialog SIP phone and a 3CX softphone installed. Both register with the 3CX PBX. The Verizon setup resides at my desk and is connected to my PC which is connected to a Linksys router. The Linksys router also resides on my desk and has an IP connection to the IP dialog phone, the Linksys PAP2 and my PC. A regular telephone is connected to the Linksys PAP through the telephone port. This setup is working for the regular telephone and Linksyst PAP2 and I am able to receive and make VOIP calls. I am attempting to use this setup as a VOIP gateway throught 3CX PBX but cannot get the line assigned by Verizon and being used in the Linksys PAP to register. If I can get the line to register I can then use the IP dialog phone and eventually will move all of our phones to SIP phones. It seems it should be simple to get the line to register however I am not successful and maybe with my setup it is not possible.