Programmatic Mute/Unmute in Genesys Cloud Embeddable Client App (JS SDK)

General Discussion
1

Trying to hook up a hardware mute button to the Genesys Cloud Embeddable Client App (ECA) using the JavaScript SDK. The goal is straightforward: read the current audio state and toggle it without triggering the UI controls.

We’re running SDK version 1.24.1. The call object from the onCallCreated event looks like it has the methods, but the behavior is inconsistent. Sometimes call.mute() works fine. Other times, it throws a TypeError: call.mute is not a function or just silently fails to update the state on the server side.

Here’s the basic handler we’ve got so far:

const handleHardwareMute = async (call) => {
 try {
 if (!call || typeof call.mute !== 'function') {
 console.warn('Mute method unavailable for call:', call);
 return;
 }
 
 // Attempt to toggle
 const currentState = call.muted;
 if (currentState) {
 await call.unmute();
 } else {
 await call.mute();
 }
 console.log('Mute state toggled');
 } catch (err) {
 console.error('Failed to toggle mute:', err);
 }
};

The call object definitely exists when the event fires. We’re verifying the call state is ACTIVE. The issue seems to be that the mute and unmute methods aren’t always attached to the call instance immediately, or they require a specific subscription to be active first. We tried waiting for call.mediaState to be CONNECTED before calling these methods, which helps but doesn’t fix it 100% of the time.

Environment details:

  • Genesys Cloud ECA JS SDK v1.24.1
  • React 18 frontend
  • Custom hardware USB mute button sending key events
  • Calls are initiated via client.calls.createCall()

Has anyone successfully implemented a reliable external mute toggle? Is there a specific event we need to listen to before the call object is fully populated with these methods? The docs are a bit sparse on the exact lifecycle of the call object properties.