VC-811Cisco IOS Voice, Video, and Fax Configuration GuideCaller ID on Cisco 2600 and 3600 Series Routersand Cisco MC3810 Multiservice ConcentratorsThis appendix describes Cisco IOS configuration for caller ID as supported on the Cisco MC3810multiservice concentrator and on Cisco 2600 and 3600 series routers. It includes the following sections:• Caller ID Overview, page 811• Caller ID Prerequisites Tasks, page 814• Caller ID Configuration Task List, page 815To identify the hardware platform or software image information associated with a feature in thisappendix, use the Feature Navigator on Cisco.com to search for information about the feature or refer tothe software release notes for a specific release. For more information, see the “Identifying SupportedPlatforms” section in the “Using Cisco IOS Software” chapter.Caller ID OverviewCaller ID (sometimes called CLID or ICLID for incoming call line identification) is an analog serviceoffered by a central office (CO), which supplies calling party information to subscribers. Typically, thecalling party number, and sometimes the name, appears on a station (also called extension) device suchas a PC telephony software application screen or the display on a telephone. Type 1 caller ID providesthe calling party information while the call is ringing, and Type 2 caller ID provides the additionalconvenience of calling number display while the recipient is on another call. In this release, Ciscoprovides only Type 1 caller ID support.The caller ID feature supports the sending of calling party information from foreign exchange station(FXS) loop-start and ground-start ports into a caller ID equipped telephone device. The FXS portemulates the extension interface of a private-branch exchange (PBX) or the subscriber interface for a COswitch.The caller ID feature supports receiving calling-party information at foreign exchange office (FXO)loop-start and ground-start ports. The FXO port emulates a connection to a telephone and allowsconnection to a PBX extension interface or (where regulations permit) a CO subscriber line.The following are benefits of using caller ID:• Enterprises—Caller ID is invaluable for increasing efficiency through its use in computer telephonyintegration (CTI) applications, where for example, calling party information can be used to retrieveclient information from a database when a customer call is received.