Polycom DOC2560C - Manual (Page 106)

Chapter 3-Basic Operation
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The New Reservation – General tab dialog box opens.
3 Optional. Select the Enable ISDN/PSTN Dial-in check box if you
want ISDN and PSTN participants to be able to connect directly to the
conference.
4 Optional. Automatically generated conference and chairperson
passwords can be changed or deleted. For more information, see the
RMX 1500/2000/4000 Administrator’s Guide, "Automatic Password
Generation Flags” on page 18-43 .
5 If Enable ISDN/PSTN Dial-in option is selected, either enter a dial-in
number, or leave the Dial-in Number field blank to let the system
automatically assign a number from the dial-in range defined for the
selected ISDN/PSTN Network Service.
6 Click the OK button.