All clients are external to the local network.
I have added this from the server. I can provide additional log entries if needed...
10:45:50.764 Call::Terminate [CM503008]: Call(1): Call is terminated
10:45:50.670 Call::Terminate [CM503008]: Call(1): Call is terminated
10:45:50.545 Call::Terminate [CM503008]: Call(1): Call is terminated
10:45:50.483 InviteADS:

nAckNotReceived [CM503018]: Call(1): ACK is not received
10:45:20.717 FaxCfg::updateContact [CM504008]: Fax Service: registered as sip:
[email protected]:5060 with contact sip:
[email protected]:5100;user=phone
10:45:20.202 FaxCfg::updateContact [CM504010]: Fax Service: unregistered contact sip:8888:5100;user=phone
10:45:18.264 CallCtrl:

nLegConnected [CM503007]: Call(1): Device joined: sip:
[email protected]:5060
10:45:18.233 CallCtrl:

nLegConnected [CM503007]: Call(1): Device joined: sip:
[email protected]:5070;rinstance=7573a254104ca46a
10:45:18.217 MediaServerReporting::SetRemoteParty [MS210003] C:1.1:Answer provided. Connection(transcoding mode):75.148.140.46:9000(9001)
10:45:18.217 MediaServerReporting::SetRemoteParty [MS210001] C:1.2:Answer received. RTP connection: 66.49.255.51:18008(18009)
10:45:18.217 CallLeg::setRemoteSdp Remote SDP is set for legC:1.2
10:45:09.952 Line:

rintEndpointInfo [CM505003]: Provider:[VOIPGo] Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Asterisk PBX] Transport: [sip:10.1.10.105:5060]
10:45:09.952 CallCtrl:

nAnsweredCall [CM503002]: Call(1): Alerting sip:
[email protected]:5060
10:45:09.498 MediaServerReporting::SetRemoteParty [MS210002] C:1.2:Offer provided. Connection(transcoding mode): 75.148.140.46:9002(9003)
10:45:09.342 CallCtrl:

nSelectRouteReq [CM503004]: Call(1): Calling: VoIPline:10000@[Dev:sip:
[email protected]:5060]
10:45:09.280 CallCtrl:

nSelectRouteReq [CM503010]: Making route(s) to [sip:
[email protected]:5060]
10:45:09.264 MediaServerReporting::SetRemoteParty [MS210000] C:1.1:Offer received. RTP connection: 75.71.51.204:42000(42001)
10:45:09.264 CallLeg::setRemoteSdp Remote SDP is set for legC:1.1
10:45:09.264 Extension:

rintEndpointInfo [CM505001]: Ext.1001: Device info: Device Identified: [Man: 3CX Ltd.;Mod: 3CX VoIP Client;Rev: 1] Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [3CX Phone v5.1] Transport: [sip:10.1.10.105:5060]
10:45:08.811 CallCtrl:

nIncomingCall [CM503001]: Call(1): Incoming call from Ext.1001 to [sip:
[email protected]:5060]
10:45:06.358 CallLeg:

nNewCall [CM500002]: Info on incoming INVITE:
INVITE sip:
[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 75.71.51.204:5070;branch=z9hG4bK-d87543-29527427453d0e2d-1--d87543-;rport=5070
Max-Forwards: 70
Contact: [sip:
[email protected]:5070]
To: [sip:
[email protected]:5060]
From: "3CXPhone"[sip:
[email protected]:5060];tag=cc0afe6c
Call-ID: MWI4NTI1NDhkN2FjZGE3NjA1Yzk3NmU5MDYwNzEwYjg.
CSeq: 2 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, NOTIFY, REFER, OPTIONS
Proxy-Authorization: Digest username="1001",realm="3CXPhoneSystem",nonce="12859577105:35298a0152af5f0caa4e9e301f697d3f",uri="sip:
[email protected]:5060",response="cce490d25e6a89570e3633e38357d6b6",algorithm=MD5
Supported: replaces
User-Agent: 3CX Phone v5.1
Content-Length: 0