Polycom DOC2231A - Manual (Page 46)

MGC+50/MGC+100 Getting Started Guide
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3. Click OK.
If your system supports only IP networks, a confirmation message is
displayed.
4. Click OK.
If you are defining both IP and ISDN Network Services, the Network
Configuration Wizard dialog box is displayed.
To configure an ISDN Network Service:
5. Click the ISDN button.
The ISDN Configuration dialog box opens.
6. In the ISDN Service Name box, enter a name or use the default name
(ISDN Default Service).
If you are defining only the IP Network Service, the Network Configuration dialog
box closes and the new IP Network Service appears in the IP Network Services
list.