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 
> <[email protected]> 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
> <[email protected]> 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 <[email protected]>
>> Sent: Monday, April 15, 2024 9:08 AM
>> To: [email protected]
>> Cc: Barry Flanagan <[email protected]>
>> 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: [email protected]
>> 
>> 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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> http://www.voipembedded.com
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