Freepbx over network/4g: the destination phone rings but no voice

Hi guys

I have asterisk work fine in my internal network
But when I try out using csipsample with 4g connection, my cell phone ring But no voice
I have static ip here But I use dyndns with ddclient too.
I made several attempts to deal with this site:
to configure sip.conf and /etc/resolv.conf
using a 4g phone call operator NAME : CLARO. I don’t know if thatt’s VOLTe or that’s 4g calls possible
this is my log

help me