Polycom Viewstation 128 User Manual page 21

Getting Started
If your service provider gave you these numbers, enter them here. If you do not
have these numbers, highlight the Start icon and the ViewStation will locate
them for you. If you quit while it is searching, your ViewStation will reboot and
you have to start the setup process all over again. However, your previous
entries are preserved. If you are behind a PBX, select the PBX icon, since you
do not need to locate SPIDs.
ISDN Switch
On the ISDN Switch screen, select the network switch. Your ISDN service
provider should have given you this information when you purchased the line.
If the SPID was automatically detected, the system will bypass this screen
because it found the information already. If you entered your SPID numbers
manually, however, you need to use the arrow buttons on the remote to select
the switch type.
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ViewStation User's Guide