Hi 3CX'ers. This is my first dabble into VOIP, so please do bear with my absolute noobishness, and I hope you will forgive me for it. I am doing a setup of 3CX for a client. They have 3 phones and 3 sip accounts. Info about them: Code: Phones: SPA921 Server: HP ML110 G5 Series. Internal Nic's: 1 OS: Server: Windows server 2008 Foundation edition 3CX Server: Windows XP Pro under VMware. (to make it clear, VMware is serving on the foundation 2008 server, an XPP install) Sip Provider: sipgate.co.uk Windows Firewall & all other firewalls on router & on XPP are disabled. The problem is that when I make an outgoing call, or receive an incoming call, I cannot hear audio from the other person. I think that this would usually be a firewall problem (which would make sense) however, I am all sorts of confused as to what more ports I need to make open! I can't (for some reason on this stupid router) make a PC DMZ, so I think (unless that really is the problem) then my solution will have to be a case of finding all of the right ports. Currently, in my desperation, the following ports are opened and pointed at the server. Code: 5004 UDP 5060 UDP/TCP 8000 - 8012 UDP 10000 UDP/TCP 3478 UDP/TCP 5090 UDP 9000-9015 udp What more do I need for incoming audio? The outgoing audio works fine by the way, so do calls and transfers etc etc, it's just this stupid problem. Is there a port that sipgate use that is not above? Could it be something else other than a firewall? Maybe an issue with it being a VMware server? Your help would be much appreciated. P.s. I don't have access to the server's log at the moment, as the server is in a different office, and I didn't enable remote access (well done me), however if it is required I will see if I can grab it at some point today.