NEC Univerge SV9100 Hardware Manual page 318

Issue 1.2
5 - 58
BS (Retro)-L KIT

The optional Retro keypad (in black or white), is compatible with the
term
D Series i telephone, allowing the terminal to be used with the IPK II,
IPC 500 and IPS multiline terminals.
Figure 5-49 Standard Numbered Keypad
Figure 5-50 BS (Retro)-L KIT
Installing DT Series Digital and IP Multiline Terminals
UNIVERGE SV9100