Hi ml, this is my problem: I have an Asterisk on remote site (my office) and two x-lite at home behind a ful cone nat. Both my ua can register, I can place and receive calls from both the phones and I can hear voice, so I don't think I have nat problem but when when i place a call if the called party hangup, calling party doesn't receive the signal and it stays connected. I also experienced the same problem placing a call on hold. Calling party can place the call on hold (called party listen moh) but called party cannot do it. Watching asterisk CLI no called party signals were detected? Why these? Can someone help me? Regards. Marco Ziglioli Alascom Services S.R.L.