Polycom VVX 1500 D - Manual (Page 107)

Customizing Your Phone
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The following figure shows a phone set up with one phone line (1952). Since
one Line Key is taken, there are five keys available that you can assign as
Speed Dial Keys. In this example, five Speed Dial Keys are set up.
The following figure shows a phone set up with six different phone lines (1952,
1953, 1954, 1955, 1956, and 1957). In this case, there are no available keys that
you can assign as Speed Dial Keys.