Cisco Unified MeetingPlace Release 6.1 -- About the Optional Carrier Identification Code
The Carrier Identification Code (CIC) is a four-digit code established by the FCC in the U.S. to identify each phone company. For example, the CIC for AT&T is 1288. If a subscriber has a variety of services available from various carriers, the CIC is used to select a carrier.
The CIC is not always included in an NSF code. The carrier that provides the connection from Cisco Unified MeetingPlace to the central office determines if the CIC is included in the NSF.
Note: Some carriers abbreviate their CIC to three digits, dropping the most significant digit. When you request CIC information, you must determine if the carrier uses three or four digits.