In the Cardserver INI file, under [OPTIONS], there is a PHONEDISPLAY= entry.
This can contain the following values, depending on which PABX and phones are connected:
0 - None
1 - Alcatel 4200 / 4400
2 - Samsung 7200 / 7400
3 - Intertel
4 - Ericsson BP250
5 - Siemens HiPath 3750 / 3800
6 - Ericsson MD110
7 - Alcatel OXO
8 - Panasonic TDA
9 - Samsung 7200 / 7400 headset mode
10 - Avaya Definity 2-wire
11 - LG LDK50 / Opticon 100
12 - Avaya IP Office