Altigen Alti-IP 600H Administration Manual page 20

This opens the AltiGen IP Phone Configuration window where, after
setting up an IP extension, you can set the following parameters for the
IP extension:
Figure 3. IP Phone Configuration Window
The left side of the IP Phone Configuration window displays all the
Alti-IP phone extensions that have been set up in the system.
Alti-IP 600H Manual 10