PassFinder AP2520 VoIP Router/Gateway Operation Manual
Version 1.10 / Mar. 2002
AddPac Technology Co., Ltd.
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213
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5.6.3.
Configuring User Class
User-class setting is used to reject receiving calls from the unauthorized users
when an origination call arrives in the FXO from the network. When a user
attempts a call to the FXO port through the network while no user-class is set,
the user will have to enter the extension code digit after hearing dial tones
generated by the PBX if the FXO is connected to the internal line of the PBX.
However, if the FXO is connected to the PSTN, the user will hear dial tones
created by the PSTN switching machine and will have to enter the other side
number of the PSTN.
If any user-class is set, the user who makes the first call will hear “beep” sound
instead of the dial tone. If the user enters the
password
at this time and if the
password is authorized, the user can enter as many numbers as max-digits
defined in the user-class. (“Beep” sound may not occur due to the gateway
on the origination side.) In this way, users can control internal calls, local calls,
long-distance calls, and international calls by controlling “
max-digit
.”
Users can set more than one user-classes and set call limits for other user-classes.
To keep the security of calls incoming to the FXO port through the network,
users can use this command and
security permit-FXO
in the AP2520.
Since it is
possible to directly attempt calls to the PSTN through this FXO port or indirectly
attempt calls to the PSTN through the PBX internal line, unauthorized remote
users can attempt calls as well.
To prevent unauthorized users’ attempting calls, the security shall be kept.
Two security systems that the AP2520 Gateway provides have following
advantages and disadvantages.
With “security permit-FXO” command, remote users does not need to enter the
password so they can easily access the network. However, IP address of the
VoIP peer on the other side shall be registered and the gatekeeper cannot be
used at the same time. Also, it is not possible to bar calls of the registered
peers by class.
With the “voice class user” users need to enter the password digit but stronger
and multi-classed call barring is possible.
