question

There are several way to do this.  I'm assuming you don't have RC phones(?)  So I'll offer this option.  With the caller on the phone, dial ##, then you are instructed to enter an extension followed by #.  Call is transferred. 

a) Warm Transfer or Transfer: when you want to announce yourself or tell to the other end who is calling. Cons: the recipient will see the extension number who made the transfer but not the Caller ID. b) Cold / Blind / bXfer Transfer: when you want to send a call directly to the extension of phone without announcing it. Pros: the recipient will see the Caller ID. In our Polycom or Cisco phones we could dial # # to put a call on hold in a faster way, instead of searching for the right option on the screen. From there you can perform a Warm or Cold Transfer.