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30
EN
3.2.4
Setting up the VPN connection
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ISDN connection for Dynamic VPN
Entry
Remote ISDN calling number
Remote ISDN caller ID
Gateway 1
phone number 1
ISDN ID1
Gateway 2
phone number 2
ISDN ID2
The ISDN parameters are required only when a connection has to be initiated
to a gateway with a dynamic IP address.
Therefore, these entries are requested if at least one VPN gateway has an
dynamic IP address, and both of the gateways have an ISDN connection.
Enter the calling number of the remote station in the ISDN calling number
field then. The complete calling number including all necessary area and
country codes is required. If your device is connected to the ISDN via a PBX
system, a prefix generally will be needed for an external call (usually '0').
The stated ISDN caller ID (CLI - Calling Line Identfication) is used to identify
and authenticate callers. When an LANCOM receives a call, it compares the
ISDN caller ID entered for the remote station with the actual caller ID
transferred via the D-channel. An ISDN caller ID generally consists of an area
code and an MSN.
The transmission of the caller ID can be blocked either by your local exchange
provider, or by PBX systems. Please ensure that the transmission of the caller
ID is enabled at both sites.
3.2.5
Passwords for VPN
Entry
Password for secure transmission
of the IP address
Shared secret for encryption
(pre-shared key)
Gateway 1
Password
Shared Secret
Gateway 2
Password
Shared Secret
The Password for secure transmission of the IP address is used by
Dynamic VPN for the exchange of dynamic IP addresses. In case of an ISDN
connection, the caller identifies itself with this password, whereas in case of
IP address transmission through the Internet (via ICMP or UDP packet), the
datagram containing the current IP address is encrypted with this password.
The exact same password has to be entered on both sides.
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