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Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Chapter3 Create Connection Wizards
Dial String
A SPID is usually a 7-digit telephone number with some optional numbers.
However, service providers may use different numbering schemes. For the
DMS-100 switch type, two SPIDs are assigned, one for each B channel.

SPID1

Enter the SPID for the first BRI B channel provided to you by your ISP.

SPID2

Enter the SPID for the second BRI B channel provided to you by your ISP.
Dial String
Enter the phone number of the remote end of the ISDN BRI or analog modem
connection. This is the phone number that the ISD N BRI or analog modem
interface will dial whenever a connection is made. The dial string is provided to
you by your service provider.
Backup Configuration
ISDN BRI and analog modem interfaces can be configured to work as backup
interfaces to other, primary interfaces. In that case, an ISDN or analog modem
connection will be made only if the primary interface goes down for some reason.
If the primary interface and connection goes down, the ISDN or analog modem
interface will immediately dial out and try to establish a connection so that
network services are not lost.
Select whether this ISDN BRI or analog modem connection should act as a
backup connection.
Note the following prerequisites:
•The primary interface must be configured for Site-to-Site VPN.
•The IOS image on your router must support the SAA ICMP Echo
Enhancement feature.