Assembly: Microsoft.Rtc.Collaboration (in microsoft.rtc.collaboration.dll)
Syntax
Exceptions
Exception type | Condition |
---|---|
ArgumentNullException |
Thrown when arguments are null. |
ArgumentException |
Thrown when invalid arguments are passed. |
InvalidOperationException |
Thrown when the session is an invalid state to send a Refer. |
Remarks
The platform supports multiple Refer operations at the same time. Some clients may not support parallel Refer operations. Until the first notification is received, the capability of the remote client is not known. For this reason, the first Refer operation is special in the sense the subsequent Refer operations are queued until first notify is received to learn the capability of the remote client. If the remote supports parallel Refer operations, the queued Refer operations are all released. If the remote does not support parallel Refer operations, the Refer operations are carried out one at a time. When the terminating notify is received, the next Refer operation is started. For this reason, calling synchronous method to send Refer or waiting on the operation to complete (EndRefer) before the callback is called are highly discouraged.