Polycom DOC2585A - Manual (Page 118)

Chapter 3- Audio Only Basic Configuration and 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 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.
5 Click the OK button.
A confirmation box is displayed stating that the Reservation time is
past due and that the conference will become ongoing.
6 Click OK.