
94 FSU 5622 ESP User Manual 61200.175L1-1
Chapter 9. Configuring Dial Backup Options
PHONE NUMBERS
The FSU 5622 ESP stores up to 5 numbers of 36 digits each. Edit
a phone number by reentering the entire number. This process
overwrites the previously stored number.
ISDN Dial Backup
Setting the Service Profile Identifier (SPID)
For ISDN dial backup, the service profile identifier (SPID) is
stored in Stored Number 6. The SPID is a sequence of digits
identifying ISDN terminal equipment to the ISDN switch when
more than one ISDN set has been attached to the same central
office line. The SPID is assigned by the telco when the ISDN line
is installed and normally resembles the phone number.
Only the AT&T 5ESS switch is capable of recognizing a point-to-
point configuration, eliminating the need for a SPID. All other
switch types require a SPID.
Setting the Local Directory (LDN) Number
For ISDN dial backup, the LDN is stored in Stored Number 7.
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