which ip address of VPS Ubuntu?
tcpdump host and port 5060
or other port if not 5060
12:38:03.117593 IP (tos 0x0, ttl 64, id 50207, offset 0, flags [none], proto UDP (17), length 569)
vmi2569147.contaboserver.net.sip > 198.163.206.120.sip: SIP, length: 541
OPTIONS sip:198.163.206.120 SIP/2.0
Via: SIP/2.0/UDP 89.116.27.116:5060;branch=z9hG4bK7a8dee97;rport
Max-Forwards: 70
From: "asterisk"
;tag=as45afb10c
To:
Contact:
Call-ID: 42db7df307c3302102c0998948947687@89.116.27.116:5060
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX 16.30.0
Date: Mon, 28 Apr 2025 10:38:01 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0