Asterisk and radio communication. Joint via chan_alsa?

Question

Asterisk

Good day everyone!
There is a need to organize the junction of the asterisk and the deployed VHF radio communication network. In order for the management / dispatcher to dial a number on the phone and talk with radio subscribers, and not to distribute to everyone by radio station (voltage, however), and batteries are killed from rare use ...
In the first approximation, from the VHF side, everything is simple - I’ll take a portable radio station and through the headset connectors I will connect the tone frequency channel (reception / transmission). Launching the radio station by voice activity in the channel (the first word is eaten up, but not critical - callsign + number 1XX).
From the side of asterisk, it seems like you can use the sound system to use the server itself as a sip peer (number "X").
The scenario is as follows: "wire" subscribers (sip / dahdi) call the allocated number "Y", which is processed in the dialplan in the form of creating a conference between X and Y without notifications, and a notification context Z (message to the wired subscriber "you are on the air. you can speak.")
Accordingly, additionally incoming calls to the allocated number U also get into the conference and can negotiate with radio subscribers (they already don’t need a message - they will hear the negotiations and join the dialogue according to all the rules). Upon exiting the conference of wired subscribers, it closes and the radio station goes into standby mode due to the lack of voice activity.
Who will say what? Maybe you already have experience with something like this?

Answer 1

To prevent VOX from eating the first word, have Asterisk output the word automatically.
The radio and computer should be connected through an isolation transformer.

Answer 2

Looks quite functional. chan_alsa or chan_oss with auto-hookup, conference call via Originate. Well, or use any SIP-phone with access to the headset and automatic pickup.
Only you may have to coordinate the parameters of the sound input / output of the computer and the walkie-talkie.