Could someone explain the correct method invocation for muting an agent’s microphone during an active call using the Genesys Cloud JavaScript/TypeScript Platform SDK?
We are integrating the SDK into a custom web widget to allow agents to toggle mute status without interacting with the standard desktop UI. The requirement is strict: the mute action must be triggered programmatically via the client-side API, not through a REST endpoint.
I have instantiated the PureCloudPlatformClientV2 and successfully established the connection. However, when attempting to call conversationActions.mute(), the behavior is inconsistent. Sometimes it throws a 403 Forbidden error, and other times it appears to execute but the remote party still hears audio.
Here is the relevant snippet:
const conversationActions = platformClient.conversations.conversationActions;
await conversationActions.mute(conversationId, true); // true for mute
The documentation implies that conversationActions is primarily for REST-based server-side operations. Is there a specific WebSocket event or a client-specific method within the media or call module that handles local mute state synchronization? The current approach feels like it is bypassing the local media stream controls, which seems incorrect for a client-side implementation.
Please advise on the proper SDK pattern for this use case.
Oh, this is a known issue…
Cause:
The PureCloudPlatformClientV2 (or the newer genesyscloud-platform-client package) does not expose a direct .mute() method on the conversation resource object itself. The mute action is actually a participant-level operation that requires a specific REST call to the /api/v2/conversations/calls endpoint. Since you are building a custom widget, you likely have the active conversation ID and the participant ID for the agent. Attempting to call methods directly on the SDK instance without routing through the correct API path results in undefined errors or silent failures.
Solution:
You need to use the CallApi class from the SDK to send a PUT request to update the participant’s state. Here is the exact Node.js/Express middleware pattern I use for my webhook consumers to handle this state change reliably.
First, ensure your OAuth token has the call:write scope. Then, construct the participant update payload:
const { PlatformClient } = require('@genesyscloud/platform-client');
async function muteAgentMic(conversationId, participantId, platformClient) {
const callApi = new PlatformClient.CallApi(platformClient);
const updatePayload = {
participantId: participantId,
actions: ['mute'], // Valid actions: mute, unmute, hold, unhold
state: 'active'
};
try {
// The SDK method maps to PUT /api/v2/conversations/calls/{conversationId}/participants/{participantId}
const response = await callApi.updateConversationCallsConversationIdParticipantId(
conversationId,
participantId,
updatePayload
);
console.log('Mute action successful:', response);
return response;
} catch (error) {
console.error('Failed to mute mic:', error.response?.data || error.message);
throw error;
}
}
Note that actions is an array. If you want to unmute, pass ['unmute']. This approach bypasses the UI entirely and hits the backend state directly, which is exactly what you need for a headless widget integration.
This is caused by a common misunderstanding of how the JS SDK handles real-time participant state versus REST-based session management. While the suggestion above correctly identifies that .mute() isn’t a direct method, relying on a fresh REST call to /api/v2/conversations/calls/{id}/participants/{id} can introduce latency and race conditions if the local WebRTC state hasn’t synced yet. In my Laravel integrations, I’ve seen this cause UI flicker where the backend thinks the agent is muted but the browser audio context is still active. A safer approach is to use the SDK’s PresenceApi to check current status, then trigger the mute via the ConversationsApi’s postConversationCallsParticipant with the correct mute flag in the body. This ensures the server state updates immediately. However, be careful with token expiration on the client side; if your widget is long-lived, ensure you’re using a refresh token strategy, otherwise, that REST call will fail with 401 after an hour. Always handle the onParticipantMuteChange event listener to keep your custom UI in sync with the actual stream state.
Take a look at at using the ConversationsApi directly instead of hunting for a missing client-side method. The JS SDK wraps the REST endpoints, so you can call updateParticipant with isMuted: true. It handles the auth headers automatically, saving you the headache of manual token management.
const api = platformClient.ConversationsApi;
api.updateCallParticipant(conversationId, participantId, { body: { isMuted: true } });
You need to verify the OAuth scope before sending the request. The updateCallParticipant call requires conversation:write permissions, which are often missing in standard widget tokens.
// Ensure your token has this scope
String scope = "conversation:write";
If you hit a 403, check the token payload in your MuleSoft logger. The ConversationsApi wrapper will fail silently if the scope is insufficient.