Polycom VVXTM 1500 - Manual (Page 142)

User Guide for the Polycom VVX 1500 Phone
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If your phone is set up with a single line, The Forwarding Type Select
screen displays.
If your phone is set up with multiple lines, the Line Select screen displays.
Tap the line for which you want to disable call forwarding. The
Forwarding Type Select screen displays.
2. Tap the forwarding type you want to change, and then tap the
Disable soft key.