I am not able to hear any call progress rings over the WAN on my Linksys spa942 IP Phone, to an asterisk 1.4.23 server. I am able to hear the person who picks up and they are also able to hear me. I am able to hear the dial tone before I dial. The problem is while the call is being placed, until the other person picks up the phone, I do not hear any ringing in the head set. I have proxy and outbound proxy enabled on the phone and have also tried the STUN server setting. The phone rings normally when someone calls me on the Linksys spa942.
The problem does not occur if the Linksys phone is on the same LAN as the asterisk box.
There are NAT firewalls at both locations.
I have ports 5060 open on both firewalls, and have also tried opening 10000-20000