<--- SIP read from UDP:
10.43.150.1:5060 --->
SIP/2.0 500 Server Internal Error
Via: SIP/2.0/UDP 10.43.хх.хх:5160;branch=z9hG4bK0a210cc1;received=10.243.хх.хх;rport=5160
Call-ID: 6ab8016d285d97ee421ebc131d59ee1c@10.43.хх.хх:5160
From: "Unknown"<sip:877777777@10.43.хх.хх:5160>;tag=as07b222c5
To: <sip:10.43.хх.хх1>;tag=hx8cjxne
CSeq: 102 OPTIONS
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY,INFO,PUBLISH,MESSAGE
Date: Tue, 19 May 2020 05:07:44 GMT
User-Agent: FPBX-15.0.16.49 (16.6.2)
Content-Length: 0