Zopier issues passing audio

Has anyone got Zopier to work with ASL3.

i am able to connect, it says registered, I am able to interact using DTMF, however, no audio will come across and after about 30 seconds or so, it disconnects.

i assume it is a network issue, as it works perfectly fine if i connect to the internal IP but if i use the WAN ip, it won’t pass audio.

i have opened port 5060 TCP, i am using TCP as the tranport not udp