Need some help with occasional disconnects

I have a FreePBX 15.0.16.73 running on a Dell Optiplex at a client.
While they make 100 calls a day without issue, 1 or 2 will drop without warning.
They are asking me to find out why and my log reading skills are virtually nil.
I have attached the snippit from the logs which show the beginning till the end from the Full-Day log.
Can someone steer me to what the problem might be, and where to learn more about the logs?

Thanks in advance.

I tried to paste the log here but as a new user I am limited to what I can paste it seems.

Essentially the call goes out on the trunk and they are talking for 3 minutes when an entry in the log shows
[2020-09-10 10:54:28] VERBOSE[2403] chan_sip.c: Registered SIP ‘22’ at 192.168.1.51:5060
[2020-09-10 10:54:29] VERBOSE[2403] chan_sip.c: Registered SIP ‘22’ at 192.168.1.51:5062

Every thing still works and next entry 3 minutes later
[2020-09-10 10:57:49] VERBOSE[18090][C-00000166] bridge_channel.c: Channel SIP/22-00000510 left ‘simple_bridge’ basic-bridge <1afbe861-7776-4bbd-b3e3-64e316138372>
[2020-09-10 10:57:49] VERBOSE[18091][C-00000166] bridge_channel.c: Channel SIP/273098_Main2-00000511 left ‘simple_bridge’ basic-bridge <1afbe861-7776-4bbd-b3e3-64e316138372>
[2020-09-10 10:57:49] VERBOSE[18090][C-00000166] app_macro.c: Spawn extension (macro-dialout-trunk, s, 27) exited non-zero on ‘SIP/22-00000510’ in macro ‘dialout-trunk’
[2020-09-10 10:57:49] VERBOSE[18090][C-00000166] pbx.c: Spawn extension (from-internal, 16474043777, 13) exited non-zero on ‘SIP/22-00000510’
[2020-09-10 10:57:49] VERBOSE[18090][C-00000166] pbx.c: Executing [[email protected]:1] Macro(“SIP/22-00000510”, “hangupcall”) in new stack
[2020-09-10 10:57:49] VERBOSE[18090][C-00000166] pbx.c: Executing [[email protected]:1] GotoIf(“SIP/22-00000510”, “1?theend”) in new stack
[2020-09-10 10:57:49] VERBOSE[18090][C-00000166] pbx_builtins.c: Goto (macro-hangupcall,s,3)

Something is wrong here. I am guessing that the device at 192.168.1.51 is an IP phone that has multiple line appearances, each with a different local port. But, if you’re using chan_sip, they have to use different extension numbers but both seem to be 22. What device is this? Why is it configured this way?

Agreed. Perhaps you should switch your extensions to PJSIP, so that you can have multiple devices (or multiple line appearances) present on a single extension #.

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