Can I bulild an offline dmr server?


We have a system was builed  with internet but our internet provider go for a system renewal now we need to work with out internet for 3-5 months. we want to use our dmr radios (which is connected to mmdvm hotsposts) to comminicite. Currently we have  a server runs in office and long range wifi antenas all around mountains.

Questation : Can I build an offline dmr server? which has talk groups or at least some sorth of groups in to the server ?

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