Welcome to the RingCentral Community

Yes ...We have assigned the existing phone to the supervisor to monitor the call.

Can you make a voice call to the supervised extension (either to its direct number or via main company number * extension number) to see if your "existing SIP Phone" receive the incoming call and be able to connect to that call?

Or can you use the device id to make a call-out call programmatically?

Note: To avoid mistake, you don't need to specify the accountId when calling an API using the .Net SDK. The SDK uses the '~' tilde and the server recognize the account from the access token of the authenticated user.

Yes ..I am able to receive the calls on my Existing Phone number. As suggested, I also removed the account id from the api call but still getting the same exception. Also, I noticed that when we call the call supervision api using the Existing Phone Device Id, we get the missed call notification in the call logs.

I see the RingCentral Phone app on the list. Can you select that device and use that device id to supervise a call to see if it works. This is just to make sure your supervision settings are correct and isolate the problem for further investigation.

Thanks for your reply..
Yes..it is working if we use the RingCentral Phone app device id to supervise the call. Supervisor phone (RingCentral App) get the call (based on the telephone session id) if we use the rc app device id for call monitoring.

Sample Code:

SuperviseCallSessionRequest Scr = new SuperviseCallSessionRequest

{

mode = "Listen",

supervisorDeviceId = deviceId, [Ringcentral App Device Id]

agentExtensionId = agentExtensionId,

};

var result1 = await rc.Restapi().Account(accountId).Telephony().Sessions(telephonySessionId).Supervise().Post(Scr, null);

Kindly review the above details and suggest the debugging step regarding existing phone device id issue.