
Configuring Dial Services
B-20
117353-B Rev. 00
Dial Backup over an ISDN Network
This ISDN example assumes the following:
• All BRI connections use a National ISDN 1 (NI1) switch.
• There is no incoming call filtering.
• Sending complete IEs are not used for call setup.
• The adaption rate is 64 Kb/s.
• CHAP is the PPP authentication protocol.
• IP is the only LAN protocol configured.
• The Ethernet segments shown in the network illustration are not configured.
• Only one phone number and SPID are used. (BRI lines usually have two
phone numbers and SPIDs.)
Figure B-4
shows dial backup service over an ISDN network. In this
configuration, the primary circuit is using PPP.
Figure B-4. Dial Backup over an ISDN Network
You can configure the routers for this network using Site Manager or the BCC.
For instructions, go to one of the following sections:
• Configuring Dial Backup Using Site Manager
on page B-21
• Configuring Dial Backup Using the BCC on page B-26
ISDN
ASN
AN
Router 1 Router 2
S131
.1
S12
.2
140.1.1.0
ISDN 1
ISDN 1
Local phone no: 4364444
Switch type: NI1
CHAP local name: ASN
CHAP secret: ISDN
Local phone no: 4363333
Switch type: NI1
CHAP local name: AN
CHAP secret: ISDN
DS0025A
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