Hi guys, I require assistance with the following scenario. I have: 1 x 3cx server - IP 172.24.220.10 2 x Asterisk server - IP 10.50.0.11 / 10.50.0.12 with a Nat'd IP of 10.50.0.13 that listens on port 5060. Our PRI's are currently connected to the Asterisk servers which are set up as HA. I want to connect the 3cx server to the Asterisk servers so that they can communicate with each other, meaning I want to call extensions on Asterisk from 3cx and vice versa. In asterisk I've set the trunk up as follows: PEER Details: username=90002 type=peer secret=90002 host=172.24.220.10 context=from-trunk qualify=yes insecure=invite USER Details: type=peer insecure=invite context=from-trunk outboundproxy=172.24.220.10 Registration String: 90002:email@example.com:5060/90002 You'll notice that I've provided the username and password, I'll change that once I've managed to get the 2 PBX's connected and talking to each other. On 3cx side I've set up the Asterisk server as a PSTN Gateway providing the Nat'd IP address of 10.50.0.13 and the 90002 as the Authentication ID and Authentication Password. Looking at the 3cx Ports/Trunks Status screen I see that the Gateway is in a "Not Registered" state and looking at Asterisk I see the following: *lilo:/var/log/asterisk # tail -f full | grep "172.24.220.10" [Aug 26 14:42:38] NOTICE chan_sip.c: -- Registration for 'firstname.lastname@example.org' timed out, trying again (Attempt #1) I can ping the 3cx server from the Asterisk server without any problems. The reason from this excersize is that I want to move everything (10+ years worth of data) off our antiquated Asterisk infrastructure and onto our snazzy new 3cx system. Any assistance / feedback would be greatly appreciated! Thanks in advance!