Nethserver + OpenVPN + IAX Asterisk

Good Morning!

I’m trying to close an IAX communication through an Openvpn tunnel and I’m not getting it.

After closing the VPN tunnel I receive the following routes:

The ip 192.168.17.17 is the Asterisk on the other end, this IP forwards packets to the IP 10.77.208.89:4569 that is defined in eth0 of the Nethserver.

So far it seems to me that everything is fine, even though two parties do not communicate. I have already released access to port 4569 from the red interface.

Any suggestion?

IAX2 as far as i can rembember could be “ok” for Wan connections, should be also encrypted.
Therefore: why not use directly public ip address of Asterisk?

A VPN is from a client, and requires it to be done through the tunnel. If I could have already done it out, I believe the problem is without redirecting the IAX2 port to my internal IP.