Hi there,

Just to add to the above, I had a similar issue not so long ago where I was getting replies to my OPTIONS from my dispatcher destinations, but then they started rejecting them (for some unknown reason) causing all my dd's to go into flag: IP state.

I just removed my probing to those carriers in the end. Not ideal, but it solved my immediate issue.

I would confirm that the Teams Direct Routing endpoints reliably respond to all OPTIONs packets first. Or maybe just disable the probing for now as the default value for ds_probing_threshold is just "1" so any missed packets will change the flag on a default dispatcher config.

Hope it helps.

John.

On Mon, 18 Dec 2023 at 20:57, Sergiu Pojoga via sr-users <sr-users@lists.kamailio.org> wrote:

Here's my last and best trick, which eliminates Kamailio entirely from being the culprit:

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

Regards,
Sergiu
--
Teams PBX connector with full MS Direct Routing automation for service providers
Web: https://teamsphone.net

On Mon, Dec 18, 2023 at 3:23 PM faisal.jamil.khan--- via sr-users <sr-users@lists.kamailio.org> wrote:
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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