lowbee

see my earlier post below

http://nch.invisionzone.com/index.php?/topic/12446-express-talk-loses-sip-registration/#entry44266

Not sure if the newer version of the software let you set the "Keep Alive" interval......I now use a free apps on Andriod so I don't need to upgrade or use this ExpressTalk anymore.

Forwarding the ports won't work unless you change the UDP port closing time to be longer than the registration interval (which is one hour - 3600 seconds). UDP port on most routers expire in 300 seconds so if you registered and try to call yourself after 5 minutes, chance are ExpressTalk won't ring. I think at least my version of ExpressTalk (v4.03) does NOT send "Keep Alive" packet to keep the UDP port open; hence, this problem. I haven't figure out a way to workaround this shortcoming of ExpressTalk yet short of changing my UDP closing time to 3600 (which I try to avoid doing).