sipexer -options -contact-uri "sip:customers.teamsphone.net:5061;transport=tls" -fd "customers.teamsphone.net" -td "sip.pstnhub.microsoft.com;transport=tls" \
-tls-insecure -tls-certificate "/usr/local/etc/kamailio/bundle.crt" -tls-key "/usr/local/etc/kamailio/privkey.pem" \
-xh "Max-Forwards: 70" -ua "Ribbon-SIPGateway" "sip:sip.pstnhub.microsoft.com:5061;transport=tls"
If you don't get a reply from Microsoft.PSTNHub then something is awkwardly wrong in your setup, not related to Kamailio, likely Teams backend config or networking.
Note:
(1) adjust certs path to your case
(2) install sipexer if you don't have it: https://github.com/miconda/sipexer
new updated list according to the SRV records and after removing tls port.
1 sip:sip.pstnhub.microsoft.com;transport=tls 0 10 socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
1 sip:sip2.pstnhub.microsoft.com;transport=tls 0 20 socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
1 sip:sip3.pstnhub.microsoft.com;transport=tls 0 30 socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
1 sip:sip4.pstnhub.microsoft.com;transport=tls 0 40 socket=tls:172.31.19.8;ping_from=sip:abcsbc.com
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