GS WAVE connects but no audio


I have set up the GS WAVE on our own cloud based server. It connects perfect.

Calls within our network connect perfect and audio very good.

However, if I call outside our network (a cell phone or landline) the call dials, but when the receiving party answers the audio cuts off. Neither I can hear nor the receiving party can hear.

It appears there is a codec or other setting I have missed/

Has anyone had this issue? Any suggestions where to look?



Had more success with this when I used TCP instead of UDP signalling.