Cisco Cisco Computer Telephony Integration Option 9.0 Developer's Guide

For switches which allow more than two calls at a device (for example G3), it is 
recommended that this request only be made through the desired held call, 
because of  the ambiguity caused by multiple held calls at the device. 

The Alternate request must be made via a call whose status is either 
LCS_CONNECT or LCS_HELD or it will fail.

The following events will be received  if this request is successful.

For the call making the Reconnect request:

OnReconnectCallConf event

For the originally current call:

OnCallConnectionCleared event

OnCallCleared event

OnCallEnd event

For the originally held call:

OnCallRetrieved event

The following events will be received by the call making the Alternate request if 
this request fails: 

OnControlFailureConf event

The Retrieve method unholds a held call.

int Retrieve()

int Retrieve(Arguments & reserved_args)

HRESULT Retrieve (/*[in,optional]*/  IArguments *reserved_args,    

(/*[out, retval]*/ int * errorcode )

Retrieve([reserved_args As IArguments]) As Long

int Retrieve(Arguments optional_args)