TIPS CSipSimple - Internal Server Error

[hostile]

I gather you are using the data plan on your cellphone. A lot of mobile providers use NAT, so in effect, you have a double NAT to your pbx. Try setting up STUN etc in your client.

I got the same prob.

It works over WIFI but not over mobile 3G/4G

I tried play with CS simple settings enable stun etc, but no effect

cant register over 4G

 

[hostile]

try https://play.google.com/store/apps/details?id=org.ubiphone&hl=en