Sony PCS-1600 Operating Instructions Manual page 82

SPID Registration for Customers in the USA
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Chapter 4 Registration and Setup
Enter your country code in the Country Code box.
If the network switch type is AT&T 5ESS (National ISDN)
or NTI DMS-100 (National ISDN)
Country Code is "1"
If the network switch type is AT&T 5ESS (Multipoint
Custom ISDN)
Country Code is "1 10"
If the network switch type is AT&T 5ESS (Point-to-Point
Custom ISDN)
Country Code is "1 12"
If the network switch type is NTI DMS-100 (Custom
ISDN)
Country Code is "1 11"
Open the ISDN Setup menu (Page 2).
Enter your LDN (s) and sub-address in the Local Number
boxes.
If one ISDN line is used, register the LDN in the boxes A1
and A2.
If two ISDN lines are used, register the LDNs in the boxes
A1, A2, B1, B2.
If three ISDN lines are used, register the LDNs in the
boxes A1, A2, B1, B2, C1, C2.
If the network switch type is AT&T 5ESS (National ISDN)
Each LDN is given for three channels (CH A1 and A2, CH
B1 and B2, CH C1 and C2)
or
Each LDN is different as a separate LDN is given for each
channel.
The following shows the use of three ISDN lines for
AT&T 5ESS (National ISDN).
In case of each LDN is given for two channels.