Brother DCP-110C - Manual (Page 174)

A - 19 APPENDIX A
When you are using a TAD, the LCD shows Ext. Tel in Use .
Connections
The external TAD must be connected as shown above.
1
Set your external TAD to one or two rings. (The machine’s Ring
Delay setting does not apply.)
2
Record the outgoing message on your external TAD.
3
Set the TAD to answer calls.
4
Set the Receive Mode to Manual .
(See Choosing the Receive Mode on page 4-1.)
Do not connect a TAD elsewhere on the same phone line.
TAD
TAD