AT&T 7406BIS - Manual (Page 57)

Transfer
✓
To send present call to 1
another extension or
outside number
2
Press [
Transfer
] [dial tone]
● Present call put on hold and you are given a new call
appearance
Dial extension or number to which the call is to be
transferred
[ringback tone]
●
Remain on the line and announce call if desired; if no
answer or number dialed is busy, return to held call
by pressing its call appearance
3
4
Press [ Transfer ] again
● Call is sent to dialed extension or number
Hang up or press [
Drop
]