Can't get the 3CX System to register the 3CX Client.

[gcl]

Installed the 3CX V5 System and the Client on the same PC.
Running Windows XP Pro, Ver 2002, SP2, no firewall, DEP set for essential Windows services ony.
Set the parameters according to the manual - best ability.
Some parameters not well documented.
I'm not a network or SIP guru.
I did get Brekeke to work, but it has a 60 day limit.
Can't get the Client to register.Considering switching to YATE.

Any ideas/comments?
Thanks.

 

[Pentangle]

Comment 1 - why are you putting the PBX and the client on the same PC? If you're going to do that, at least run it in a VM!!