When I'm calling the following code snippet:
avCall.ApplicationContext = avCall;
avCall.BeginTransfer(avCall, SelfTransferCB, avCall);
where the original call has been received from a PSTN user with a tel uri, that thorugh my app has been placed in a sip placeholder. If the call is from a Lync user, then the self transfer works without any problems, but when its originated from a tel uri, the selftransfer cast a FailureRequestException "The transfer operation failed. For more information, refer to the message data in the exception."
How can I initiate a selftransfer on a PSTN user??