Glossary of Terms

Understand basic Public Safety definitions and terms.

Trunk

Definition:

A central office circuit terminating in the phone equipment on the customer premise. A circuit between central offices.

ESCO

Emergency Service Central Office Number. The information delivered to the PSAP when there is an ANI failure between the end office and the 9‐1‐1...

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Interoffice Trunk

A trunk used to interconnect two Central Offices.

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CIC

Circuit Identification Code. The part of a CCS/SS7 signaling message used to identify the circuit that is being establishedbetween two signaling...

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UICC

Universal Integrated Circuit Card. The UICC is the smart card used in mobile terminals in GSM and UMTS networks. The UICC ensures the integrity and...

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