Polycom MGC-50 Getting Started Manual page 38

MGC-50/MGC-100 Getting Started Guide
3-14
12. In the Span Definition dialog box, define the following parameters:
The default values displayed for the Span's technical parameters are appropriate
for most ISDN networks, therefore you skip their definition. The Leased Lines
section of this dialog box is enabled only when defining an ISDN Leased Lines
Service. For more details, refer to the MGC Administrator's Guide, Chapter 3.
13. Click Next to continue.