Polycom DOC2560C - Manual (Page 62)

Chapter 2-First Time Installation and Configuration
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The IP Network Service is created and confirmed.
16 Click OK.
During the initial RMX setup, if the system detects the presence of the
RTM ISDN card, the ISDN /PSTN Network Service definition screens of the
Fast Configuration Wizard are enabled.
If there is no RTM ISDN card in the RMX or if you do not want to define
an ISDN/PSTN Network Service, go to Step 33..
The Fast Configuration Wizard’s ISDN/PSTN configuration sequence
begins with the ISDN/PSTN dialog box:
A new ISDN/PSTN Network Service can be defined even if no RTM ISDN card is
installed in the system but only via the ISDN/PSTN Network Service ->Add New
Service dialog box.