AT&T MERLIN LEGEND System Reference Manual page 548

Hardware
Delay Announcements
Additional Adjuncts
Adjuncts and Adapters Not Supported
5-42 Adjuncts
If the system doesn't have DID trunks, fax stations should be programmed to
personal lines. When the system has DID service, incoming calls can be
directed automatically to individual fax stations or to machines in calling groups.
Delay announcement recordings are used when there is a delay before an
incoming call is answered (such as with calling groups). Announcements can be
made with industry-standard announcement devices connected to a station port
on a 012 module or a 008 OPT module, or by an interface such as an MFM or
GPA.
Additional station adjuncts can be connected:
answering machines
cordless phones
credit card verification terminals
PCs (connected through modems, ISDN 7500B Data Modules, or directly
with a built-in modem)
CAUTION:
The following analog telephone adjuncts and adapters cannot be used with
the system and in some cases will damage the device or the system if
connected.
Basic Telephone and Modem Interface (BTMI)
Basic Telephone and Modem Interface-2 (BTMI-2)
ATR Interface (ATRI)
MTR Interface (MTRI)
Off-Premises Extension (OPX) Unit
System 25 Direct Extension Selector (DXS)