Polycom MGC-100 Getting Started Manual page 46

MGC-50/MGC-100 Getting Started Guide
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12. Click OK.
The Sub Service dialog box closes and you are returned to the PRI
Settings dialog box (step 9).
13. 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 detailed description of the Span definition parameters and
Leased lines definition, refer to the MGC Administrator's Guide.
14. Click Next to continue.