Cisco 7971G


Has anyone successfully configured one of these phones (7970G or 7961G) using NAT? We have many 7940’s and 7960’s working just can’t get these to register for some reason. The trouble seems to be caused by the “” parameter. I tried searching everywhere but no one seems to know any of the valid values. Some say 1, some say true, some say to leave it blank. I’ve tried every combination and even tried with different firmware versions (8+ and 9+) to no avail.