
Configuring Dial Services
12-2 114062 Rev. B
How ISDN Calls Use Phone Lists
For ISDN calls, the router uses the local, outgoing, and incoming phone lists. The
instructions to configure each phone list begin on page
12-3.
Outgoing and Incoming Phone Lists
The router uses the outgoing phone list to place calls to remote routers on an
ISDN network. The router uses the incoming phone list to implement incoming
call filtering. You use incoming call filtering with caller ID service, which lets you
identify a remote caller. If you enable incoming call filtering, the router matches
the caller’s phone number with a number in the incoming phone list, which
identifies and authorizes the caller. Features such as callback for demand circuits
rely on incoming call filtering for certain callback modes. Refer to Chapter 5 for
more information about the callback feature.
Local Phone Lists
For BRI connections, the local phone list numbers identify the local calling router
to remote routers on the network. The router places the local phone number in the
ISDN outgoing call setup message. This number (along with SPIDs in the United
States and Canada) also identifies the router to the ISDN switch. Certain switches
require this number before they agree to activate a circuit. Your ISDN service
provider assigns the numbers for your local phone list.
The router also uses the local phone list during BAP negotiations for
bandwidth-on-demand service. The non-monitor router passes a local phone
number to the monitor router when the monitor router requests additional
bandwidth. When the monitor router receives the phone number, it uses that
number to call back the non-monitor router, which then activates another line.
How V.25bis and Hayes Calls Use the Outgoing Phone List
For V.25bis and Hayes calls, the router uses the outgoing phone list to pass the
remote router’s phone number to the modem to establish a connection.
Caution: To use incoming call filtering, you must purchase caller ID service.
If you enable incoming call filtering without having caller ID service, the
router rejects all incoming calls.
Kommentare zu diesen Handbüchern