Ad hoc network IP mesh voice data transmission system requirement

Ad hoc network IP mesh voice data transmission system requirement:
Transceiver could be any form such as module or chip or a system-on-module SOM or System-on-chip SOC and fulfills the following conditions:
. Transmit live voice, done, and control commands at the same time in both directions (from the Tx to the Rx and vice versa at the same moment).
. The communication distance is up to 3 km.
. Immune from interference and overhearing between users’ devices who are located in the same area.
. It does not require a line of sight to have a strong and uninterrupted connection between the Tx and Rx.
. Supports a large number of users at the same time without interference or overhearing. A maximum of 250 users at the same moment and same area.
. Operating on Free-licensed radio frequency range.