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Point-to-Point Configuration
In some areas, the Direct-Dial-In (DDI) number is less expensive than the MSN; therefore, you
might want to subscribe to point-to-point ISDN to employ the DDI function. In this case, only one
modem can be connected to the ISDN line and the TEI (Terminal Equipment Identifier) is always
zero. The TEI is established by setting the bit 1 of S-register S119 as follows:
•
S119.1 = 0 to disable point-to-point DDI function (default)
•
S119.1 = 1 to enable point-to-point DDI function
Placing a Call
To initiate a call, configure the Model XM128 modem according to the bearer service (or protocol)
that you want to use.
ATBnn is used for ISDN data calls.
Placing a Call for DSS1
The ATDx command ATDx[Yn][Nn]called_party_number[/[Zn]called-party-subaddress/] is used
for dialing.
Where x = I (for ISDN data calls), A (for the analog adapter 1), or B (for the analog adapter 2).
Yn specifies the type of number:
•
Y0 for unknown (default if Yn is omitted)
•
Y1 for international number
•
Y2 for national number
•
Y3 for network specific number
•
Y4 for subscriber number
Advanced ISDN
Reference Guide for the Model XM128 ISDN Digital Modem
7-11
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