Diameter Signaling Router

TDMA - Time Division Multiple Access
CDMA - Code Division Multiple Access
GPRS - General Packet Radio Service
UMTS - Universal Mobile Telecommunications System / IMT-2000
HSPA - High Speed Packet Access
LTE - Long Term Evolution
PSTN - Public Switched Telephone Network
SS7 - Signaling System 7
IETF - Internet Engineering  Task Force
3GPP - The Third Generation Partnership Project
IMS - Internet Protocol Multimedia Subsystem
EPC - Evolved Packet Core