Julmar conference problem

Hi,

I am using julmar tapi wrapper. It is working fine, I am able to dial,
transfer and disconnect call but I am unable to make conference. First
I make H 323 IP call to first machine and it is all okay. When I try
to make conference using the code given below it give me exception
"This method is not supported" when it tries to execute
call.Conference(consultCall, false);

Note: call object in the given code is connected call object of call
made to first machine.
try
{
TCall call = TapiCall.objTCall;
TCall consultCall = null;

TAddress addr = gAddress;
LINEADDRESSTYPES addrType =
(LINEADDRESSTYPES)LineAddressType;

TAPIMEDIATYPES mediaType = TAPIMEDIATYPES.AUDIO;
if (addr.QueryMediaType(TAPIMEDIATYPES.VIDEO))
mediaType |= TAPIMEDIATYPES.VIDEO;

//Create a call -- this should always succeed
consultCall = addr.CreateCall(DestinationAddress,
addrType, mediaType);
call.Conference(consultCall, false);

}
catch (Exception ex)
{
}

I wondor why it is giving me such exception. I did the transfer with
the same code pattern. If someone has accoplished conference calling
then his/her help can take me out of this. Any help in this regard
will be highly appreciated.

Regards

Raja Adil.
.