We just recently implemented VoIP into our NEC phone system. Internally the VoIP phone connects to the system perfectly. I am having an issue getting it to work from the outside. NEC says that they really only support VoIP using VPN and not NAT, however i can't have my users running around with a VPN router wherever they go along with an IP set. The tech who set everything up for us gave me port numbers to pass through the firewall but i cant seem to get it working. I have a Watchguard firewall that i have created services to allow ports to go through to an internal IP address using NAT. On the IP set i have it connecting to the public IP address that goes thorugh our firewall, get NATed and passed to the internal IP of the card.
If anyone has done this before or is familiar with NEC and what ports they use let me know. The ports below is what the tech gave me:
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