I

information signaling

Provides a caller information about the status of their call (for example, ring back or a busy signal).

Integrated Services Digital Network (ISDN)

A common channel signaling technology available as a Basic Rate Interface (BRI) connection or a Primary Rate Interface (PRI) connection.

Internet Protocol (IP)

The protocol that runs over the Internet and uniquely identifies components with IP addresses.

interoffice trunk

A connection from one phone switch to another.

IP Contact Center Enterprise Edition

A collection of Cisco IP telephony applications for a call center that supports up to 800 agents per Cisco CallManager (CCM) cluster.

IP Contact Center Express Edition

A Cisco call center application that supports up to approximately 200 agents and is available in three variants: Standard, Enhanced, and Premium.