AT&T MERLIN LEGEND Release 2.0 Installation Section page 132

Installing Telephones and Adjuncts
SAA-Compatible Alert Devices
Compatible alerts include horns, bells, chimes, and strobes:
Bell
Horn
Chime
Strobe
Unsupported Telephones, Adjuncts, and
Adapters
The following analog telephone adjuncts and adapters are not to 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 Unit (OPX)
System 25 Direct Extension Selector (DXS)
Table 3-1 provides additional information on the telephones and adjuncts to
be avoided.
Installing Adjuncts 3-29