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Using Shorthold Mode 75

Callback numbers

Regardless of whether the RAS client or the RAS server carries the charges, the server

requires the client’s correct callback number.

Note: If the exchange does not send the client’s call number, the WAN-Miniport driver

will reject the RAS server’s shorthold requests. In this case, it will have no information on

what number it should dial for a callback.

If the RAS client numbers provided by the exchange cannot be called back, for example

because the leading zero for the area code (Euro-ISDN) or the number required for

external calls with PBX systems is not provided, there are two options:

• Call number check (see Number Checking

on page 33):

The correct callback number is preconfigured for every RAS client.

• Callback prefix (see Callback Prefix

on page 32):

One or more digits are placed before the callback numbers of all RAS clients (e.g. for

an external call).

Callback numbers with callback

If the server is being operated in callback mode, the call number or the callback prefix is

not checked when establishing the connection after a shorthold. The WAN-Miniport driver

records all PPP callback queries and the negotiated callback period internally and

compares them with the incoming and outgoing calls. Because the server has already

dialed the right number on callback, it makes no difference if the exchange has provided

an incomplete number. If all calls are made with unique identifiable MSN/EAZs, the

WAN-Miniport driver will recall the right number.

Determining correct callback numbers

The call number provided by the exchange and the actual number called can be displayed

as follows:

Set up a trace file with the Diva Server Diagnostics tool (see Diva Server Diagnostics

page 119). The number can be read at the entries ‘Called by xxx’ or ‘Dialing xxx.’

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Eicon Networks S93 Installationsanleitung Seite 75