I am using kamailio (5.6.5 (x86_64/linux))

i am trying to establish direct routing with MS-Teams getting this issue upon sending option packets.

I tried with including server_name as well but not able to resolve the issue. may be some tech gurus can help me out.

Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23837]: INFO: <script>: Sent out tm request: OPTIONS sip:sip.pstnhub.microsoft.com;transport=tls SIP/2.0
Via: SIP/2.0/TLS abcsbc.com:5061;branch=z9hG4bK7c5b.7ad63320000000000000000000000000.0
To: sip:sip.pstnhub.microsoft.com;transport=tls
From: sip:abcsbc.com;tag=64ff6b492a7d9ab14de1f0b7c15c9c17-25003c71
CSeq: 10 OPTIONS
Call-ID: 25555f22142f22f4-23837@0.0.0.0
Max-Forwards: 70
Content-Length: 0
User-Agent: kamailio (5.6.5 (x86_64/linux))
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23837]: INFO: <script>: Sent out tm request: OPTIONS sip:sip2.pstnhub.microsoft.com;transport=tls SIP/2.0
Via: SIP/2.0/TLS abcsbc.com:5061;branch=z9hG4bK8c5b.b0cf0513000000000000000000000000.0
To: sip:sip2.pstnhub.microsoft.com;transport=tls
From: sip:abcsbc.com;tag=64ff6b492a7d9ab14de1f0b7c15c9c17-8784af70
CSeq: 10 OPTIONS
Call-ID: 25555f22142f22f5-23837@0.0.0.0
Max-Forwards: 70
Content-Length: 0
User-Agent: kamailio (5.6.5 (x86_64/linux))
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23837]: INFO: <script>: Sent out tm request: OPTIONS sip:sip3.pstnhub.microsoft.com;transport=tls SIP/2.0
Via: SIP/2.0/TLS abcsbc.com:5061;branch=z9hG4bK5c5b.a165cf12000000000000000000000000.0
To: sip:sip3.pstnhub.microsoft.com;transport=tls
From: sip:abcsbc.com;tag=64ff6b492a7d9ab14de1f0b7c15c9c17-60095adb
CSeq: 10 OPTIONS
Call-ID: 25555f22142f22f6-23837@0.0.0.0
Max-Forwards: 70
Content-Length: 0
User-Agent: kamailio (5.6.5 (x86_64/linux))
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23855]: ERROR: tls [tls_server.c:1319]: tls_h_read_f(): protocol level error
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23855]: ERROR: tls [tls_util.h:49]: tls_err_ret(): TLS write:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed (sni: unknown)
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23855]: ERROR: tls [tls_server.c:1323]: tls_h_read_f(): src addr: 52.114.132.46:5061
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23855]: ERROR: tls [tls_server.c:1326]: tls_h_read_f(): dst addr: 172.31.19.8:0
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23855]: ERROR: [core/tcp_read.c:1499]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f8f327181f0 r: 0x7f8f32718318 (-1)
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23857]: ERROR: tls [tls_server.c:1319]: tls_h_read_f(): protocol level error
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23857]: ERROR: tls [tls_util.h:49]: tls_err_ret(): TLS write:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed (sni: unknown)
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23857]: ERROR: tls [tls_server.c:1323]: tls_h_read_f(): src addr: 52.114.32.169:5061
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23857]: ERROR: tls [tls_server.c:1326]: tls_h_read_f(): dst addr: 172.31.19.8:0
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23857]: ERROR: [core/tcp_read.c:1499]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f8f32741588 r: 0x7f8f327416b0 (-1)
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23865]: ERROR: tls [tls_server.c:1319]: tls_h_read_f(): protocol level error
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23865]: ERROR: tls [tls_util.h:49]: tls_err_ret(): TLS write:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed (sni: unknown)
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23865]: ERROR: tls [tls_server.c:1323]: tls_h_read_f(): src addr: 52.114.76.76:5061
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23865]: ERROR: tls [tls_server.c:1326]: tls_h_read_f(): dst addr: 172.31.19.8:0
Dec 12 19:32:55 abcsbc.com /usr/sbin/kamailio[23865]: ERROR: [core/tcp_read.c:1499]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f8f32726108 r: 0x7f8f32726230 (-1)

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