I just setup a 3cx server. I can register fine from the sipPhone app on my iphone, however I cant get the same or different accounts to register from my GrandStream handytone 496 device. Ive tried setting both fx port 1 and fxs port 2 to different extensions. My status screen displays as: MAC Address: 00.0B.82.12.43.EE WAN IP Address: 192.168.2.159 Product Model: HT496 Software Version: Program-- 18.104.22.168 Bootloader-- 22.214.171.124 HTML-- 126.96.36.199 VOC-- 188.8.131.52 System Up Time: 0 day(s) 1 hour(s) 1 minute(s) Registered: FXS1 Account: No FXS2 Account: No PPPoE Link Up: disabled NAT: detected NAT type is open Internet I followed the settings in the article: http://www.3cx.com/sip-phones/Grandstream-HandyTone386.html as it was the closest I could find to a 496. Any ideas where I might be going wrong?