Thanks. Look like an issue on the MS side. I think perhaps this recent plotting of Teams from 365 has changed things. MS tells me I need a 365 E3 or E5 license including Teams, but the EEA do not included teams any more. I am trying to work through it with MS.

- Barry Flanagan

On 15 Apr 2024, at 18:57, Ovidiu Sas via sr-users sr-users@lists.kamailio.org wrote:

Domain of URI works ok with sip.pstnhub.microsoft.com. Domain of From works ok with localhost. Domain of To works ok with sip.pstnhub.microsoft.com. Those are not important.

It is important that you have the right Contact: Contact: sip:[YOUR_DOMAIN]:[YOUR_PORT];transport=tls

If your Contact is right, then something is misconfigured on MS side. Check that you have the right licences, the right port, that there are no typos ... Enable debug logs and check that connection is successful and ensure that all the certs are valid and set to be verified.

-ovidiu

On Mon, Apr 15, 2024 at 1:38 PM Tyler Preder via sr-users sr-users@lists.kamailio.org wrote:

...

We set the URI domain in the OPTIONS to match our system’s fqdn. From your OTPIONS that would be sip:msteams.domain.com. We do not use sip.pstnhub.microsoft.com as the domain.

From: Barry Flanagan via sr-users sr-users@lists.kamailio.org Sent: Monday, April 15, 2024 9:08 AM To: sr-users@lists.kamailio.org Cc: Barry Flanagan barry@flantel.com Subject: [SR-Users] Issue with MS Teams OPTIONS ping - no response

Hi

Using Kamailio 5.6 and trying to get Teams integration working. Failing at the first step! I receive no reply from MS to my OPTIONS ping. AFAIK it is correect, here is the OPTIONs sent:

OPTIONS sip:sip.pstnhub.microsoft.com;transport=tls SIP/2.0

Via: SIP/2.0/TLS msteams.domain.com:5061;branch=z9hG4bK0c2b.da69f3c3000000000000000000000000.0

To: sip:sip.pstnhub.microsoft.com;transport=tls

From: sip:msteams.domain.com;tag=6d9effc2a8ec7e0b16377e93bd9e71e2-470e3c71

CSeq: 10 OPTIONS

Call-ID: 6ea8091201db565b-605531@159.65.196.10

Max-Forwards: 70

Content-Length: 0

User-Agent: ABC SBC

Contact: sip:msteams.domain.com:5061;transport=tls

From the logs (below) I can see that w are accepting the MS cert OK but get no response and ends with a 408. The domain is configured in Teams, and a user with a license was added. MY Cert is issued by GeoTrust TLS RSA CA G1.

Any idea if the issue might be on my side?

024-04-15T14:53:19.302610+00:00 msteams /usr/sbin/kamailio[605600]: DEBUG: tls [tls_domain.c:798]: sr_ssl_ctx_info_callback(): SSL handshake done

2024-04-15T14:53:19.302692+00:00 msteams /usr/sbin/kamailio[605600]: DEBUG: tls [tls_server.c:542]: tls_connect(): TLS connect successful

2024-04-15T14:53:19.302762+00:00 msteams /usr/sbin/kamailio[605600]: DEBUG: tls [tls_server.c:545]: tls_connect(): tls_connect: new connection to 52.114.14.70:5061 using TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256

2024-04-15T14:53:19.302824+00:00 msteams /usr/sbin/kamailio[605600]: DEBUG: tls [tls_server.c:550]: tls_connect(): tls_connect: sending socket: 159.65.196.10:0

2024-04-15T14:53:19.302868+00:00 msteams /usr/sbin/kamailio[605600]: DEBUG: tls [tls_server.c:418]: tls_dump_cert_info(): tls_connect: server certificate subject:/C=US/ST=WA/L=Redmond/O=Microsoft Corporation/CN=sip.pstnhub.microsoft.com

2024-04-15T14:53:19.302917+00:00 msteams /usr/sbin/kamailio[605600]: DEBUG: tls [tls_server.c:422]: tls_dump_cert_info(): tls_connect: server certificate issuer:/C=US/O=Microsoft Corporation/CN=Microsoft Azure RSA TLS Issuing CA 03

2024-04-15T14:53:19.470476+00:00 msteams /usr/sbin/kamailio[605606]: DEBUG: tls [tls_server.c:729]: tls_h_tcpconn_close_f(): Closing SSL connection 0x7fd3c77639c8

2024-04-15T14:53:28.770710+00:00 msteams /usr/sbin/kamailio[605591]: DEBUG: dispatcher [dispatch.c:3617]: ds_options_callback(): OPTIONS-Request was finished with code 408 (to sip:sip.pstnhub.microsoft.com;transport=tls, group 1)

-Barry

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