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BSC : Base Station Controller
BTS : Base Transceiver Station
eNB : evolved NodeB
GERAN : GSM/EDGE Radio Access Network
GGSN : Gateway GGSN Support Node
IMS : IP Multimedia Subsystem
LTE : Long Term Evolution
MME : Mobility Management Entity
RNC : Radio Network Controller
PCRF : Policy and Charging Rules Function
PDN : Packet Data Network
P-GW : PDN Gateway
PSTN : Public Switched Telephony Network
S-GW : Serving Gateway
SGSN : Serving GPRS Support Node
UTRAN : UMTS Terrestrial Radio Access Network
VoIP : Voice over IP