Hey there everyone. I am currently trying to register my sipgate account with my 3CX server. This was working a while ago but I came into work one day to find that the server will no longer register the line with sipgate. I have tried over and over to get this going. I have confirmed that all the ports are open and the firewall tests report success. There are no errors in my logs to suggest something is wrong. When the server tries to register the line the server logs just state that the line is unregistered, logs are below: 13:06:41.033 LineMgr:nRegUpdAor Unregistered line: L:500(Sipgate) 13:06:41.033 ClientRegs:nRequestRetry Registration attempt for L:500(Sipgate) is scheduled in 60 sec. 13:05:28.474 LineMgr:nRegUpdAor Unregistered line: L:500(Sipgate) 13:05:28.474 ClientRegs:nRequestRetry Registration attempt for L:500(Sipgate) is scheduled in 40 sec. 13:04:36.085 LineMgr:nRegUpdAor Unregistered line: L:500(Sipgate) 13:04:36.085 ClientRegs:nRequestRetry Registration attempt for L:500(Sipgate) is scheduled in 20 sec. 13:04:03.930 ClientRegs::Register [CM504003]: Sent registration request for 500@Sipgate 13:04:03.290 CallMgr:nAddIPs IP(s) added:[192.168.111.4] 13:03:59.306 ClientRegs::Register [CM504003]: Sent registration request for 500@Sipgate 13:03:58.993 ExtnCfg::updateContact [CM504001]: Ext.208: new contact is registered. Contact(s): [sip:email@example.com:5060;transport=udp/208] 13:03:58.665 FaxCfg::updateContact [CM504008]: Fax Service: registered as sip:888@3CXPhoneSystem with contact sip:firstname.lastname@example.org:5100;user=phone 13:03:58.337 StunClient:rocess [CM506002]: Resolved SIP external IPort (18.104.22.168:5060) on Transport 192.168.111.4:5060 13:03:58.274 ListenConnect SL: connected ics2:0/VoiceBoxManagerService at [ics2]/VoiceBoxManagerService 13:03:58.274 IVRConnected [CM501004]: Connected: IVR Service 13:03:58.274 ListenConnect SL: connected ics2:5483/IVRServer at [ics2]/IVRServer 13:03:58.196 StunClient:nInitTests [CM506001]: STUN request to resolve SIP external IPort mapping is sent to STUN server 22.214.171.124:3478 over Transport 192.168.111.4:5060 13:03:54.275 MediaServerConnected [CM112000] Media Server is connected 13:03:54.275 ListenConnect SL: connected ics2:0/MediaServer at [ics2]/MediaServer 13:03:53.900 DBA [CM501003]: Connected: Database 13:03:53.556 CallMgr::findLocalIPs [CM501006]: Default Local IP address: [192.168.111.4] 13:03:53.540 CallCtrl::thread [CM501007]: *** Started Calls Controller thread *** 13:03:53.212 CallMgr::Initialize [CM501002]: Version: 5.0.3790.0 13:03:53.212 CallMgr::Initialize [CM501001]: Start 3CX PhoneSystem Call Manager 13:03:53.212 LoadLicenceInfo [CM501010]: License Info: Load Failed I'm not sure what the cause of this is. I am running a ISA firewall on SBS server 2003 premium. The 3CX pbx is running on server 2003 elsewhere on the network. I have used wireshark to determine that the registration requests are leaving the network but I don't seem to get anything back. I have tried registering a different VOIP provider (freespeech) with also no success. Can anyone offer me any help on the matter?? Thanks very much. James.