Panasonic A210 User Manual

You can have a conversation with up to 5 people on a Conference 
call.
During a call (one active call and one call on hold):

1. [5] (Menu)
2. [192] to scroll to Conference 7 [5] (Select)

To add new participants:
3. Call the next person or answer an incoming call
4. Repeat the procedure (Step 1-2)

You can transfer an active call to a call on hold. You can connect the 
two parties into a conversation and disconnect yourself from them.
During a call (one active call and one call on hold):

1. [5] (Menu)
2. [192] to scroll to Call transfer 7 [5] (Select)

You can separate an individual from the Conference call, then you 
can have a private conversation with the person.
During a Conference call:

1. [5] (Menu)
2. [192] to scroll to Split 7 [5] (Select)
3. [192] to scroll to the required caller you wish to talk to 7 [5] 

(Select)