CallControlCall.transfer(CallControlCall) not working

Hello, does anyone have any ideas why this fails:

 

I'm using Cisco's implementation of jtapi with their 4.0.3 release.
Jtapi 1.2.

The original call is coming in through a CTI port extension. 

8001 is the extension of a SCCP phone.

 

I'm attempting the following, where call2 is an existing call.

 

CallControlCall consultCall =
(CallControlCall)jtapiProvider.createCall();

consultCall.consult(tc, "8001");

 

Thread.sleep(5000); // calling sleep to give the called party time to
answer.

 

consultCall.transfer(call2);

 

 

I keep getting the following during the transfer() call.

com.cisco.jtapi.InvalidStateExceptionImpl: Did not meet pre-conditions.

 

 

However the following pre-conditions are all met:

 

//                    Check for preconditions

//                    Let tc1 be the transfer controller on this Call

//                    Let tc2 be the transfer controller on otherCall

//                    this != otherCall

//                    (this.getProvider()).getState() ==
Provider.IN_SERVICE

//                    this.getState() == Call.ACTIVE

//                    otherCall.getState() == Call.ACTIVE

//                    tc1.getCallControlState() ==
CallControlTerminalConnection.TALKING or
CallControlTerminalConnection.HELD

//                    tc2.getCallControlState() ==
CallControlTerminalConnection.TALKING or
CallControlTerminalConnection.HELD

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