AllStarLink · EchoLink · IAX Direct · DMR · System Fusion · M17

Everything a node does.
Nothing a node costs.

QSO One is a free, complete client for AllStarLink, EchoLink, IAX Direct, DMR, System Fusion, and M17. Here's what's inside.

AllStarLink

Full AllStarLink support, two connection modes.

QSO One connects to the AllStarLink network using the full IAX2 protocol, the same protocol used by physical nodes. Choose how you connect based on your registration status.

  • Node Mode: connect using your registered AllStarLink node number and credentials
  • WT Mode (Web Transceiver): connect as a guest without a registered node
  • Automatic HamVOIP server detection for optimal routing
  • A connection cascade that finds the right path every time
  • Full DTMF support for controlling nodes and repeaters
  • Access to every AllStar node, with search and favorites
The QSO One desktop app on the AllStarLink screen, showing a searchable node directory with favorites and a node connected in Node Mode with push-to-talk and a connected-nodes list.
The QSO One Android app on the AllStarLink screen, showing the node directory with callsigns and hub names.
IAX Direct

Straight to the node, no registration.

IAX Direct connects you straight to a specific AllStar server with credentials the node operator issues you. No central registry, no Web Transceiver relay: your audio goes directly to the node. It is the most flexible way to get on when a sysop wants to give you access to their machine.

  • Connect with a host, port, username, and secret from the operator
  • Works with stock ASL3 and with HamVOIP and legacy ASL2 servers
  • IAX2 call tokens supported, so modern secure auth just works
  • Set a Caller ID name, or fall back to your account callsign

New to IAX Direct? Read the setup guide

The QSO One desktop app on the IAX Direct screen, with a saved direct node connection and an active IAX2 session showing push-to-talk and connected endpoints.
The QSO One Android app on the IAX Direct screen, showing a saved direct node connection.
EchoLink

EchoLink that works everywhere.

Many EchoLink clients fail on cellular or behind CGNAT. QSO One includes automatic proxy fallback, so you stay connected even when direct UDP is blocked.

  • EchoLink Direct: standard UDP connection for home and office networks
  • EchoLink Proxy: automatic fallback when direct connection fails
  • Works on cellular, CGNAT, and restricted networks where others fail
  • Directory of 6,500+ EchoLink stations and repeaters
  • Full DTMF support
  • Requires a valid amateur radio license and EchoLink registration (free)
The QSO One desktop app on the EchoLink screen, showing the station and conference directory with type filters and a connected EchoLink conference with a participant list.
The QSO One Android app on the EchoLink screen, showing the directory of EchoLink stations and conferences.
DMR

Full DMR, two networks, no hotspot.

QSO One brings DMR to your phone and desktop in software, with no hotspot or radio required. Connect to BrandMeister or TGIF, receive and transmit, and switch talkgroups right in the app.

  • BrandMeister: connect to the world's largest DMR network, receive and transmit
  • TGIF: connect to the TGIF network with the same one-tap simplicity
  • Switch between networks anytime, your credentials for both stay saved
  • In-app talkgroup switching that subscribes you on the fly
  • Searchable talkgroup catalog with a live “last heard” activity feed
  • On-screen, spacebar, and Bluetooth PTT, the same controls as every other network
  • No hotspot, no radio, no extra hardware
The QSO One desktop app on the DMR screen, showing the BrandMeister talkgroup catalog and an active connection to talkgroup 91 with a recently-heard station and push-to-talk.
The QSO One Android app on the DMR screen, connected to BrandMeister, showing the talkgroup catalog and call-type controls.
System Fusion

System Fusion (YSF), in software.

Run Yaesu System Fusion C4FM digital voice straight from your phone or desktop by connecting to YSF reflectors. No hotspot, no radio, no extra hardware. Your callsign is your ID.

  • Connect to YSF reflectors, receive and transmit in software
  • Reflector directory with search and favorites
  • On-screen, spacebar, and Bluetooth PTT, the same controls as every network
  • No hotspot and no radio required
The QSO One desktop app on the System Fusion screen, showing a searchable YSF reflector directory and a connected reflector with receive-all and transmit-all controls.
The QSO One Android app on the System Fusion screen, showing the YSF reflector directory.
M17

M17, the open digital voice mode, built in.

M17 is the fully open-source digital voice protocol, made by and for amateur radio. No proprietary vocoder, no central database, your callsign is your ID. QSO One connects you straight to the M17 network.

  • Reflector and module selection: pick any M17 reflector and module right in the app
  • Open Codec 2 voice: fully open-source, no proprietary codec or licensing
  • No separate registration, your callsign is your ID
  • Reflector directory with search and favorites
  • Receive and transmit, all in software
  • On-screen, spacebar, and Bluetooth PTT
The QSO One desktop app on the M17 screen, showing the reflector directory and a connected M17 reflector with push-to-talk, chat, and the station position-sharing map.
The QSO One Android app on the M17 screen, showing the M17 reflector directory.
Mobile, PTT, and audio

Stays connected. Even when your phone doesn't.

Most radio apps drop their connection the moment you switch apps or lock your screen. QSO One keeps the session alive with a persistent foreground service, and it works with the PTT hardware you already have.

  • Persistent foreground service keeps your session alive on Android
  • Stay connected while switching apps, taking calls, or locking screen
  • Bluetooth, BLE, and PoC hardware PTT buttons supported
  • Automatic received-audio leveling so every station sits at the same volume
  • Optimized for cellular networks with reconnect logic on network switches
  • Low battery impact, connection maintained without excessive wake locks
  • iOS support coming soon
Platform Support

Free. Every platform.

QSO One is free on every platform. All you need is an account with your callsign. When iOS, macOS, and Linux launch, they're free too.

Windows

Available now

Windows 10 & 11 (64-bit)

Android

Available now

Android 8.0 and above

iOS

Coming soon

macOS

Coming soon

Linux

Coming soon

Free, and built to stay that way.

QSO One is free and stays free. Become a Supporter for $3, $6 or $10 a month: Spark, Carrier or Beacon. Every tier gets the Supporter badge today. The difference right now is how much you want to give. More Supporter perks are coming.

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