Sites Site Topology
Polycom, Inc. 293
ISDN Number Assignment
Assignment
method The ISDN number assignment method for the devices in
this site. The numbers being assigned are endpoint
aliases in the form of E.164 numbers, which can be
dialed by both IP endpoints registered to the Call Server
and ISDN endpoints dialing in through an ISDN
gateway.
The assignment options are:
• No assignment. Select this option when you don’t
want to define a range of E.164 aliases for the site.
• Manual assignment. Select this option to define a
range (or ranges) of E.164 aliases for the site, but
not automatically assign those aliases to endpoints.
• Automatic assignment. Select this option to define
a range (or ranges) of E.164 aliases for the site and
automatically assign those aliases to endpoints that
register without an alias.
After an E.164 alias is assigned to an endpoint, it’s
reserved for use as long as that endpoint remains
registered with the Polycom DMA system.
If you decide not to enable Automatic assignment, you
can always manually add E.164 aliases to endpoints
from the Endpoints page (see “Edit Device Dialog Box”
on page98). And endpoints will have any aliases with
which they register.
Dialing method The ISDN inward dialing method for the site:
• DID (Direct Inward Dial). Select this option if your
ISDN gateway is provisioned with a range of phone
numbers from the ISDN service provider, and each
of these numbers will be assigned to an endpoint as
an alias.
• Gateway Extension Dialing. Select this option if
your ISDN gateway’s ISDN connection is
provisioned with a single gateway phone number
from the ISDN service provider, and endpoints will
be assigned an extension (E.164 alias) that’s
internal to the company and doesn’t correspond to
any number that can be dialed on the PSTN.
Endpoints can be dialed from the PSTN by dialing
the ISDN gateway phone number, followed by a
delimiter (usually a #) and the extension number.
The gateway receives the full number from the
PSTN and dials only the extension number on the
IP network.
Table 11-4 Edit Site dialog box (continued)
Field Description