Polycom RMX 1500 Administrator's Manual page 522

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The registration is defined in the Conference Profile - Network Services tab.
In the IP Network Services table, the system lists all the defined Network
Services (one or several depending on the system configuration).
• To register the conferencing entity to which this profile is assigned to
a Network Service, in the Registration column click the check box of
that Network Service.
• You can also prevent dial in participants from connecting to that
conferencing entities when connecting via a Network Service.
In the Accept Calls column, clear the check box of the Network Service
from which calls cannot connect to the conference.
Chapter 14-Network Services