Keyboard matrix - TKIE-3
From Zenitel Wiki
Functions
| Key | Default Intercom Function |
|---|---|
| Numeric 0-9 | Dial Digit 0-9 |
| M | Push-To-Talk |
| C | Cancel Call |
| Down | Volume Down |
| Up | Volume Up |
| Space | Accessory Toggle |
| F1-F10 | DAK Key 1-10 |
Connector J9
This is the connector J9 on the PCB: http://www.te.com/usa-en/product-1-1734598-0.html
You need this socket: http://www.te.com/usa-en/product-1-440146-0.html
And crimp terminals: http://www.te.com/usa-en/product-1734193-1.html