No audio Between NS500 Pbx and Remote IP Phone

[bongopabx]

I have my NS500 with a DSP-S card a static public IP Address.
Our branches have IP Phone model # KX-HDV130.
The phones shows registered but there's no audio on either side.

I have changed the following :
Under Media relay :
NAT - External IP Address /FQDN - to my ISP Static IP
SIP Extension /UT Extension : NAT - SIP Proxy Server Port No : 49999 (Default was 0)

Under Port Number :
UDP port No.for Sip Extension Server : 49999 (Default was 5060)

 

[obtsystems]

Changing the ports won't make a difference unless you do the firewall rules

The sip server port can stay as 5060, but I normally charge to something else like 45060 as some sip trunk providers only use 5060

In the media relay setting you can have any thing as Nat server. This has to be translated to the internal port

Ports 16000 to 16511 have to be port forward to the dSp card ip