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Chapter 8: Configuring the User Database
Perle 833IS User Guide 145
User Callback With User Callback enabled, when a user dials into the 833IS, the 833IS will
disconnect the call and then callback the user.
This can be used:
■ For additional security. The user record can contain a phone number to be used
for callback. Only if the user is at that phone number will access be permitted.
■ For centralized billing
. With callback enabled, the dial in session is charged to
the server. The user pays only for the short initial connection to the 833IS.
Callback can be either Fixed or Roaming.
■
With Fixed callback, the callback numbers are stored in the user database. In the
833IS database, two phone numbers can be stored – a main and an alternate
callback number. During the initial connection, the client asks for a callback, and
can optionally specify whether to callback the main or the alternate phone
number. (If no number is specified, the main number is used). The actual phone
number is never transmitted on the phone line. If you are using a RADIUS
database for user records, a single callback number can be set. RADIUS Callback
ID is not supported.
■
With Roaming callback, the client supplies the callback number at connect time.
The client must support the Callback Control Protocol (CBCP). This is supported
by the Perle Remote Client, the Microsoft Windows 95 and NT Dial in clients,
as well as some other third party clients. Roaming callback is also supported by
the Apple Remote Access client, using Apple's dial in protocol.
You can enable both roaming and fixed callback for a single user. If both are
enabled, the 833IS will callback the roaming number if it is supplied at connect. If it
is not supplied, fixed callback will be done.The dial-in client must support both fixed
and roaming callback for this to work.
Callback is available both analog and digital ISDN BRI connections. After
connection, you may wish to send DTMF tones for special functions. For example,
the callback may need to navigate through a PBX. You can use the Post Dial
character in the callback phone number. All numbers after this character will be sent
as DTMF tones regardless of how the number was dialed. For more information on
this topic, see the AT command “Dn - Dial” on page 243.