Multiple registration German Telekom Mobile

I’ve heard that German Telekom Mobile made technical changes where now CID can be registered from multiple endpoints (multiple SDP rel100 / rel183) which cause problems to send media to the correct address for asterisk 16.
Can someone confirm that this problem is solved by a version-switch to asterisk 19.x?
Doing a version-change from asterisk 16.3 to 19.8: Does is need freepbx version 16? Or is in the same way possible using freepbx version 15?

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