InvalidStateException when trying to transfer call (CallManager 4.02)

Hi

Here's the scenario I'm trying to work.

1) Incoming call to Terminal A. (call1)
2) Call is answered
3) Terminal A makes call to Terminal B (this puts call from Terminal A on
hold): call2
4) If call2 is picked up, call1 should be transfered to call2.

Everything works fine until 4. When I try to transfer the call (be it
call1.transfer(call2) or call2.transfer(call1)) I get an
InvalidStateException. So I checked the JTAPI documentation which says the
pre-conditions for transfer are:
Provider in service
State of call1 and call2 ACTIVE
CallControlState of the TerminalConnections on Terminal A =
CallControlState.TALKING or CallControlState.HELD

So I check for all those conditions and they are all fullfilled. Since there
are not any more conditions defined I'm stumped. I figured out that the
exception thrown is actually a InvalidStateExceptionImpl, so I cast the
exception, extract error code (0), error description (Unspecified error) and
 error name (CTIERR_UNSPECIFIED). CTIERR_UNSPECIFIED isn't even listed in
the JTAPI developer documentation and the error description really doesn't
tell me anything.

So I think something goes wrong in the Cisco JTAPI, and that error is
incorrectly returned as InvalidStateException.

If anybody has any ideas, please let me know.

Regards
Stephan

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