One more question

Hi, first of all, thanks for the reply last time.
Now, I know how the dial commando work, but I wonder about the following, let me explain by example;
Someone (A) calls my ip number(B), and I use the Dial commando to “transfer” him to a different phone © through the call commando.

A --> B --> C

but I don’t really want to do that, because then they talk through my line (B) and is holding it up. Is there any options to do a transfer, such that when it comes into the Asterisk, the call is transfered such that

  1. A—>B
  2. A-x->B
  3. A—>C

Or is that controlled by the operator of A?