Draytek VigorIPPBX 2820 Series, User Manual

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VigorIPPBX 2820 Series User’s Guide 246
authenticated, but not be encrypted. By default, this option is
invoked. You can uncheck it to disable it.
High - Encapsulating Security Payload (ESP) means
payload (data) will be encrypted and authenticated. You may
select encryption algorithm from Data Encryption Standard
(DES), Triple DES (3DES), and AES.
Local ID - Specify a local ID to be used for Dial-in setting in
the LAN-to-LAN Profile setup. This item is optional and can
be used only in IKE aggressive mode.
Callback Function The callback function provides a callback service only for
the ISDN dial-in user. The remote user will be charged the
connection fee by the telecom.
Check to enable Callback function -Enables the callback
function.
Specify the callback number -The option is for extra
security. Once enabled, the router will ONLY call back to
the specified Callback Number.
Check to enable callback budget control -By default, the
callback function has a time restriction. Once the callback
budget has been exhausted, the callback mechanism will be
disabled automatically.
Callback Budget (Unit: minutes) - Specify the time budget
for the dial-in user. The budget will be decreased
automatically per callback connection.