Zoom ADSL X6v - Manual (Page 45)

Call Forwarding
On the User Configuration menu, click Call Forwarding to
enable or disable Call Forwarding parameters and enter up to 30
priority call forwarding numbers.
Ringing Based on Caller ID
On the User Configuration menu, click Ringing Based on
Caller ID to specify distinctive ring tones for up to 30 phone
numbers:
Click Enable to turn on the distinctive ring feature, and enter the
numbers to which you want to assign a distinctive ring. The ring
patterns are the Bellcore-r1 through Bellcore-r8 tones.
45 Chapter 4: Setting Up VoIP Service