I work for Microsoft not their vendors, so why would a vendor give me access to their SBC, there is no Microsoft SBC. Now they are working on getting us something for our labs but it is a big company and these types of arrangements take time to work out. Also I am just a TL, I am basically no one, I only mention it because I do have access to a tenant with basically any Microsoft license I would need to try to get this working and I have access to resources not available to the public that may get this working as wellYou work for Microsoft but you are not able to get access to a Microsoft-certified SBC?
One issue that has been a snag with the FreeSWITCH SBC solution for Teams is that it is not certified and Microsoft's documentation says they reserve the right to reject any support requests related to Direct Routing if you aren't using a certified SBC. That's a show-stopper for many serious companies.
I'm not saying it's completely useless to you but I don't understand the point of playing around with an open source SBC when your own company is saying it's not a supported method of connecting.
I can do a step-by-step if you guys are serious about a bounty.
Although you do make a very valid point... your solution isn't feasible because as Microsoft makes changes or mark makes changes to fusion it can break something and I will have no support for it big or small that is a show stopper for most because, I won't be able to confidently advertise to my customers knowing that.
I just wish I could find some cost effective solution to this cause it is a great idea to incorporate my PBX with teams... I think I saw AudioCodes has a new product that is $10-$15 /month for <10chanels or something and would do this but I guess I need to just do more research...