No Audio between local sets

I am setting up a lab system. Two freepbx 15 running on vm machines.
System 1
System 2

Sets for system 1 and 2 are remote via site to site vpn.
set 1 - > vpn >
set 2 - > vpn >
set 3 - > vpn >

All sets can call and connect to each other but no audio between any set combination.

What am I missing in the router settings or the freepbx.


You left out many details about the VM and VPN setup. But I’ll give you a shortcut – can you successfully ping from a shell prompt on If not, fix that or explain why.

If the ping is ok, in Asterisk SIP settings, set Local Networks to / 16, Submit, Apply Config, restart Asterisk, test.

If you still have trouble, at the Asterisk command prompt, type
pjsip set logger on
or if using chan_sip
sip set debug on
make a test call, paste the Asterisk log for the call at and post the link here, along with descriptions of all network routers, firewalls, etc.

Changing the network settings fixed the problem. TKS

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