Push to talk

I know that this probably does not exist yet, but if it does has anyone ever seen a way to use push to talk with asterisk? just like how nextel works. Is that possible?



Asterisk does have a ‘repeater’ channel that lets you tie it in to a two way radio system… there was also a company a while ago selling a USB FRS/GMRS dongle that would let you use a two way radio as a SIP extension (totally unsecure of course).

Also some phones (Snom) have a PTT function where you can use a speed dial key as PTT- but all it does is tear down the call when you let go of the button I think.

Is this still state of the art? Or are there any serious solutions for connecting asterisk to radio with/or push-to-talk functionality?