Panasonic 2001 - Manual (Page 53)

Additional calling features
53
To charge a call to an account when you add someone to a
conference call:
5. Press the
Transfer
soft key when you
hear the telephone ring.
Note: You can talk privately to the
person at the transfer number before you
press the
Transfer
key.
1. Press the
Conference
soft key. The call
is placed on hold.
2. Dial the
Call Detail Recording
FFC.
3. Dial the charge account number.
4. Dial the number of the person you want
to add to the conference.
5. Press the
Conference soft key.