Acronyms

The following table provides information about the acronyms and the terminology used in the document.

Table - Acronyms

Acronym	Definition
CAS	Customer Access Support
GSM	Global System for Mobile Communications
GTA	Global Title Address
HLR	Home Location Register
MNP	Mobile Number Portability
MNPCRP	MNP Circular Route Prevention
MSISDN	Mobile Station international ISDN number
MSRN	Mobile Station Roaming Number
MSU	Message Signal Unit
RTDB	Real Time Database
SIM	Subscriber Identity Module
SMSC	Short Message Service Center
SR	Service Request
SRF	Signaling Relay Function