Cisco Transferring + Blind Transfer + Conference

You can use the call parking to join the income parties. I think your questions is how to conference the 2nd incoming call with the 1st party. Here is how you can do it.

You are talking to the first call or caller and the 2nd call come in. It depends how your incoming call is routed. If the call comes in and rings your operator's phone, you can just tell your operator to park the call. After the 2nd call is parked by the operator, you can just hit the "Conf" button on the Cisco phone. Your first call should be put on hold and you should get dial tone again. All you have to do is dial the call pickip slot number to pickup the 2nd caller. As soon as you get the 2nd caller on the line, hit "join" button on the phone to join the 1st caller together. All parties should be in conference now.

If you don't have a operator and the 2nd caller ring your extension with call waiting signal while you are talking to the first caller, you can simply hit "conf" button on the Cisco phone and hit "Answer" to pickup the 2nd caller and hit "join" again to conference the 1st caller in.