DMR transceivers usually only put the audio to the speakers if the received talkgroup is the same as the TX contact of the current channel, or the received talkgroup is in the current channel's RX group list.
Note that reflectors will be shut down on the BrandMeister network, so you will have to use talkgroups
https://news.brandmeister.network/brandmeister-dmr-reflectors-support-ending-by-end-of-2020/
If you'll get comfortable with using talkgroups, then you can try the openSPOT2's call rerouting feature.