I have had the same issue with Voip-unlimited. All of a sudden yesterday my 3CX system (v7.1.7139.0) wouldn't allow inbound/outbound calls. There were loads of "CM504005 Registration failed, Cause 408 Request Timeout; internal" messages. The server was working fine earlier in the morning but stopped working around lunchtime and we had not touched anything so it wasn't anything that we had done. I had an account with VOIPON that we used for testing so we put that in as a voip provider and setup an outbound rule to prefix the calls with 9. That worked perfectly inbound and outbound so that proved that there was nothing wrong with our firewall. I rebooted the server and it came back ok and then a few minutes later it stopped working again. This morning I have the same issue - working and then not working. I am now playing with the "time between registration attempts" and "enable keep alives"
This is an example of what happens. Notice how the registration was refreshed at 17:26:46.703 and yet seconds later when a call is made it fails with a "408 Request Tiemout; internal" message.
17:27:18.296 [CM504005]: Registration failed for: 10001@VU Main; Cause: 408 Request Timeout; internal
17:27:17.187 [CM503024]: Call(6): Calling VoIPline:07985022322@(Ln.10001@VU Main)@[Dev:sip:
[email protected]:5060]
17:27:17.187 [MS210002] C:6.2:Offer provided. Connection(transcoding mode): 91.85.230.41:9004(9005)
17:27:16.984 [CM503004]: Call(6): Route 1: VoIPline:07985022322@(Ln.10001@VU Main)@[Dev:sip:
[email protected]:5060]
17:27:16.968 [MS210000] C:6.1:Offer received. RTP connection: 192.168.10.41:16424(16425)
17:27:16.953 [CM503010]: Making route(s) to <sip:
[email protected]>
17:27:16.953 Remote SDP is set for legC:6.1
17:27:16.953 [CM505001]: Ext.1454: Device info: Device Identified: [Man: Linksys;Mod: SPA series;Rev: General] Capabilities:[reinvite, no-replaces, able-no-sdp, recvonly] UserAgent: [Linksys/SPA942-6.1.3(a)] Transport: [sip:192.168.10.19:5060]
17:27:16.953 [CM503001]: Call(6): Incoming call from Ext.1454 to <sip:
[email protected]>
17:27:16.953 [CM500002]: Info on incoming INVITE: INVITE sip:
[email protected] SIP/2.0 Via: SIP/2.0/UDP 192.168.10.41:5060;branch=z9hG4bK-b076e9c3 Max-Forwards: 70 Contact: "Vincent Herbert"<sip:
[email protected]:5060> To: <sip:
[email protected]> From: "Vincent Herbert"<sip:
[email protected]>;tag=7fdd35534640c23o0 Call-ID:
[email protected] CSeq: 102 INVITE Expires: 240 Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER Proxy-Authorization: Digest username="1454",realm="3CXPhoneSystem",nonce="414d535c0054366400:c995bf46d3837f93c72f584c407cf3ce",uri="sip:
[email protected]",algorithm=MD5,response="ff0b609e42e98c6e88ca8b136839c9b3" Supported: replaces User-Agent: Linksys/SPA942-6.1.3(a) Content-Length: 0
17:26:46.703 [CM504004]: Registration succeeded for: 10001@VU Main
17:26:46.234 [CM504003]: Sent registration request for 10001@VU Main