Yeastar with Panasonic

Hi, I'm trying to make connection between Panasonic system and S100. It has to be BRI connection, because Panasonic (analog system) hasn't got SIP trunk in this case.

I figured out how to make calls from Yeastar to Panasonic. Problem is Panasonic to Yeastar and to it's SIP trunk? Anyone with some experience, or I'll have to waste hours by myself ? :) Thank you!!


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