Hi there, I am completely new to 3CX and testing it to replace our current system. I have set everything up as i think is correctly. Trunk, inbound and outbound rules, extensions. Trunk is registering ok. I can call outbound with the extension fine, but inbound is somehow not working properly. The call is being received on the softphone. I see a brief window to accept the call for a second and it then closes and i get the message on the phone: "Cant get your call right now, please leave a message". The softphone shows that there is a missed call, so i presume it is working but somehow it's not going through properly. I ran the firewall checker and everything is in the green. Log file on the PBX shows this: 08/09/2017 12:32:13 PM - [CM503003]: Call(C:13): Call to <sip:0001@txxxxxxxxxxxxx> has failed; Cause: 487 Request Terminated/INVITE from 127.0.0.1:5080 08/09/2017 12:32:02 PM - Discarded message, because of blocked User-Agent: BadUA Recv Req REGISTER from 18.104.22.168:5081 tid=20855cb0d7ac7c17598aba5b Call-IDfirstname.lastname@example.org: REGISTER sip:22.214.171.124:5060 SIP/2.0 Via: SIP/2.0/UDP 126.96.36.199:5081;branch=z9hG4bK20855cb0d7ac7c17598aba5b;rport=5081 Max-Forwards: 70 Contact: "1670" <sip:email@example.com:5081> To: "1670" <sip:firstname.lastname@example.org:5060> From: "1670" <sip:email@example.com:5060>;tag=20855cb153c3 Call-ID: firstname.lastname@example.org CSeq: 1 REGISTER Expires: 1800 User-Agent: VaxSIPUserAgent/3.1 Content-Length: 0 If anyone could help or share some insight, that would be much appreciated.