testing with this version:

[server:default]
method = TLSv1.2+
verify_certificate = no
require_certificate = no
private_key = /etc/letsencrypt/live/abcsbc.com/privkey.pem
certificate = /etc/letsencrypt/live/abcsbc.com/fullchain.pem
ca_list = /etc/kamailio/ca_list.pem
#ca_list = /etc/letsencrypt/live/abcsbc.com/cert.pem


[client:default]
method = TLSv1.2+
verify_certificate = no
require_certificate = no
private_key = /etc/letsencrypt/live/abcsbc.com/privkey.pem
certificate = /etc/letsencrypt/live/abcsbc.com/fullchain.pem
ca_list = /etc/kamailio/ca_list.pem
#ca_list = /etc/letsencrypt/live/abcsbc.com/cert.pem

in addition

event_route[tm:local-request] {
        # xinfo("Routing locally generated $rm to $ru\n");
        if (is_method("OPTIONS") && $ru =~ "sip\.pstnhub\.microsoft\.com") {
                append_hf("Contact: <sip:DOMAIN:5061;transport=tls>\r\n");
        }
}

OK?


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