Cisco 3521 Administrator's Manual page 106

Configuring Gateway Settings
Table 3-12
Octet
Octet 3.2
Octet 4
Administrator's Guide for Cisco IPVC 3521 BRI Gateway, Cisco IPVC 3526 PRI Gateway, and Cisco IPVC 3540 PRI Gateway
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Octet Field Functions
Chapter 3 Configuring the Cisco IPVC 3500 Series Gateway
Function
Octet 3.2 is used to hold information including
Carrier Identification Codes (CIC). A CIC is
three-digit number used to access the switched
services of a particular long-distance carrier from
a local exchange line. All long-distance carriers,
and many long-distance resellers, have their own
unique CIC. One or more CIC codes are assigned
to each carrier.
Some example of CIC are:
MCI VNET: 222
•
• AT&T Communications: 288
• Sprint: 333
Octet 4 is used to hold information representing
coding values for features and services. Service
providers supply the coding values.
The octet contains eight bits numbered from 1 to
8 and from right to left, so that Bit 1 is rightmost
and Bit 8 is leftmost.
The bits contain values representing the following
functions:
• Bits 1-5=The binary Facility Coding Value
for the specified feature or service.
• Bit 6 indicates whether the facility is a feature
or a service:
– 0=The requested facility is a feature.
– 1=The requested facility is a service.
Bit 7 is always set to 1
•
Bit 8 indicates whether the requested facility
•
has associated parameters or is binary:
0=There are parameters associated with
–
the requested facility and they are
specified in Octet 5.
1=The requested facility is a binary
–
facility. There are no parameters.
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