This is what I found in the activity log. Nothing sticks out to me but then again I suck at reading these.
07/14/2022 11:21:35 AM - Leg L:12.1[Extn:107] is terminated: Cause: BYE from local
07/14/2022 11:21:35 AM - [CM503008]: Call(C:12): Call is terminated
07/14/2022 11:21:35 AM - [CM503023]: Call(C:12): Call recording is stopped, audio file: /var/lib/3cxpbx/Instance1/Data/Recordings/107/[James x]_107-%2A9105_20220714152102(12).wav
07/14/2022 11:21:35 AM - Leg L:12.2[Extn:105] is terminated: Cause: BYE from 174.81.78.96:5085
07/14/2022 11:21:13 AM - Currently active calls - 1: [12]
07/14/2022 11:21:02 AM - [CM503007]: Call(C:12): Extn:107 has joined, contact <sip:
[email protected]:5087/UDP>
07/14/2022 11:21:02 AM - [CM503022]: Call(C:12): Call recording is started, audio file: /var/lib/3cxpbx/Instance1/Data/Recordings/107/[James x]_107-%2A9105_20220714152102(12).wav
07/14/2022 11:21:02 AM - [CM503007]: Call(C:12): Extn:105 has joined, contact <sip:
[email protected]:5085/UDP>
07/14/2022 11:21:02 AM - L:12.2[Extn:105] has joined to L:12.1[Extn:107]
07/14/2022 11:21:02 AM - [CM505001]: Endpoint Extn:105: Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Fanvil X6U 2.4.12 0c383e3e3bf1] PBX contact: [sip:
[email protected]:5060]
07/14/2022 11:21:02 AM - [CM503002]: Call(C:12): Alerting Extn:105 by contact <sip:
[email protected]:5085/UDP>
07/14/2022 11:21:02 AM - [CM503025]: Call(C:12): Calling T:Extn:105@[Dev:sip:
[email protected]:5085] for L:12.1[Extn:107]
07/14/2022 11:21:02 AM - [CM503027]: Call(C:12): From: Extn:107 ("James x" <sip:
[email protected]:5060>) to T:Extn:105@[Dev:sip:
[email protected]:5085]
07/14/2022 11:21:02 AM - [CM503004]: Call(C:12): Route 1: from L:12.1[Extn:107] to T:Extn:105@[Dev:sip:
[email protected]:5085]
07/14/2022 11:21:02 AM - [Flow] Call(C:12): has built target endpoint: Extn:105 for call from L:12.1[Extn:107]
07/14/2022 11:21:02 AM - [Flow] Target endpoint for *9105 is Extn:105
07/14/2022 11:21:02 AM - [CM503010]: Call(C:12): Making route(s) from Extn:107 to <sip:*
[email protected]:5060/UDP>
07/14/2022 11:21:02 AM - [CM505001]: Endpoint Extn:107: Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Fanvil X6U 2.4.12 0c383e3e3aff] PBX contact: [sip:
[email protected]:5060]
07/14/2022 11:21:02 AM - [CM500002]: Call(C:12): Info on incoming INVITE from Extn:107:
Invite-IN Recv Req INVITE from b.b.b.b:5087 tid=22779526834795610313 Call-ID=
[email protected]:
INVITE sip:*
[email protected]:5060;user=phone SIP/2.0
Via: SIP/2.0/UDP b.b.b.b:5087;branch=z9hG4bK22779526834795610313
Max-Forwards: 70
Contact: <sip:
[email protected]:5087>
To: <sip:*
[email protected]:5060;user=phone>
From: "James x"<sip:
[email protected]:5060>;tag=4063140228
Call-ID:
[email protected]
CSeq: 2 INVITE
Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, UPDATE, MESSAGE
Content-Type: application/sdp
Proxy-Authorization: Digest username="wT9BpsP

J",realm="3CXPhoneSystem",nonce="414d535962d0345e38:24dd8c9ff326bb631050dd8abfc73d4e",uri="sip:*
[email protected]:5060;user=phone",response="7a6bea837927bea5e3f7da0a43dad436",algorithm=MD5
Supported: replaces, join, path
User-Agent: Fanvil X6U 2.4.12 0c383e3e3aff
Allow-Events: talk
P-Early-Media: supported
Mac: 0c383e3e3aff
Content-Length: 293
v=0
o=107 3710030610 5306953336 IN IP4 b.b.b.b
s=A conversation
c=IN IP4 b.b.b.b
t=0 0
m=audio 15060 RTP/AVP 0 8 9 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:9 G722/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=sendrecv
07/14/2022 11:21:02 AM - [CM503001]: Call(C:12): Incoming call from Extn:107 to <sip:*
[email protected]:5060>