Séquential Couleur Avec Mémoire (SECAM)

user-defined list of acceptable telephone numbers. Calls from those numbers are diverted to a recorded message. Calls from all other numbers ring through, as usual. See also call block, CLASS, and PSTN.

• insulation
• insulator
• insure
• integrated access device (IAD)
• integrated circuit
• integrated messaging
• integrated services digital network (ISDN)
• Integrated Services LAN (ISLAN)
• intellectual property
• intelligent network (IN)
• intelligent peripheral (IP)
• Interactive Video and Data Services (IVDS)
• interactive voice response (IVR)
• intercom
• interexchange carrier (IEC or IXC)
• interface
• interface data unit (IDU)
• interference
• interferometer
• interframe compression
• Interim Standard 136 (IS-136)
• Interim Standard 2000-A (IS-2000-A)
• Interim Standard 54 (IS-54)
• Interim Standard 856 (IS-856)
• Interior Gateway Protocol (IGP)