In September, we introduced a new vision for intelligent communications including plans to evolve Microsoft Teams into the primary client for calling and meetings in Office 365. As part of this, we a...
Updated Jan 26, 2021
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Aaron Buckley Integration with 3rd Party PBX's is not presently on the roadmap. I am not sure this is something that will be added in my opinion. Perhaps an MS PG person can comment. What I can say is that at Ignite the notion of "Bring your own SIP trunk" will be introduced which would require an SBC on prem that would connect to an existing or new SIP Trunk. This would allow you to leverage existing PSTN connections under contract for example.
Speculative Statement - I don't see why that SBC couldn't connect to an existing PBX and leverage it for a PSTN connection and quite possibly the ability to dial internal users on another phone system and vice versa. Disclaimer - Again, I don't know if this will be a reality nor if it will work the way you expect it to depending on how you define interoperability. This is pure speculation on what might be possible.
I would ask what are the driving reasons behind wanting to integrate and what you think that might look like from and end user perspective?