Voice call
Connect audio once (grants mic access), then place a call — you'll talk and hear
the radio in the browser. Audio bridges via WebRTC ↔ G.711. The service allows one audio session
and closes it when the call ends, so this page silently re-offers for each new call. (Use
localhost, not a LAN IP — the browser only allows mic capture on a secure context.)
SDS message
Default is reliable SDS-TL (what radios/Dispatcher use). Incoming SDS appears in the log below.