3CX on D-Link / configuration?

[raad]

I have bought a D-Link DVG-6004S VoIP gateway so I can use SIP features using 3CX. I have been trying to configure it to use SIP phone feature for 4 SIP outlets. But I could not configure it. I have also tried to transfer my office telephone on this gateway so I can use it as a router for normal telephone calls. I have been successful to define several extensions, and make calls using 3CX softphone. I have also received calls, but I cannot hear or speak (no audio transfer).
Has anyone had any experience using a D-Link gateway with 3CX? How should I configure the settings? Which parts are essential?

 

[galal202]

is this extensions local or wan
any way no voice after ring means port problems
so check server ports (firewall) also the router ports if you use wan

 

[raad]

is this extensions local or wan
any way no voice after ring means port problems
so check server ports (firewall) also the router ports if you use wan

We are using the extensions local, and we are not using WAN.
Could you please specify which ports should be checked, or even how?

 

[Henk]

Are the extension to extension calls not working or are the external (incomming and outgoing) not working?

H.