AT&T MERLIN LEGEND Release 3.1 Installation Manual page 229

Voice Messaging Systems and Touch-Tone Receivers
Considerations
You must connect applications that use mode codes to integrated VMI ports.
Applications that do not use mode codes, such as AT&T Attendant, connect
to generic VMI ports. The T/R ports on 012 or 016 basic telephone modules
are programmed as either generic VMI or integrated VMI.
A VMS requires a certain number of touch-tone receivers (TTRs), depending
on the number of VMS ports—see Table 8–1. The following modules supply 2
TTRs: 012, 400, 400 GS/LS/TTR, and 008 OPT (but the 008 OPT module does
not support VMS applications). The 016 module supplies 4 TTRs.
Table 8–1. TTRs Required by VMS
No. of TTRs
No. of
Required
VMS Ports
1
2
3
4
6
8
12
1
1
2
2
3
4
6
Installing Applications
8–3