Whisper Monitor

Through this interface, an extension can monitor another extension's call in Whisper mode. As a result, the monitor and the monitored extension can talk to each other, but the other party in the call can talk to the monitor.


  1. Extension A is idle, extension B is in a call (query extension list to get the extension status).
  2. Make extension A monitor extension B's call in Whisper mode.
  3. If the operation is successful, extension A will auto answer and start monitoring the extension B's conversation.
    Note: Some IP phone models or softphones may not support auto answer. In this case, IP phones or softphones will ring first, and users need to pick up the call manually to start monitoring.


  • The monitor extension's monitor mode should be Extensive or Whisper;
  • The monitored extension should allow being monitored;
  • The call monitor only happens to extensions registered on the same PBX.


POST /api/v1.1.0/extension/whisper?token={token}

Request Parameters

Name Importance Type Description
whisperer Required Int The monitor extension.
whisperedext Required Int The monitored extension


Request Example
POST /api/v1.1.0/extension/whisper?token=1e3b3ebb6a974cb42ed31de5413df52d HTTP/1.1
Content-Type:application/json; charset=utf-8
Host: api.yeastarcloud.com
    "whisperer": "1005",
    "whisperedext": "1002"
Response Sample
HTTP/1.1 200 OK
Access-control-allow-origin: *
Access-control-allow-methods: GET, POST, OPTIONS, PUT, DELETE
    "status": "Success"