Abbreviations mentioned in the lecture 3GPP - 3rd Generation Partnership Project ARPU – Average Revenue Per User AS - Application Server AVP - Attribute Value Pairs AWS - Amazon Web Services CAPEX – Capital Expense CI - Continuous Integration EC2 - Elastic Compute Cloud EPC – Evolved Packet Core EPS - Evolved Packet System ETSI - European Telecommunications Standards Institute eUTRAN - evolved UMTS Terrestrial Radio Access Network FDM - Frequency Division Multiplex FDMA - Frequency Division Multiple Access GGSN - Gateway GPRS Support Node GMSC – Gateway MSC GPRS - General Packet Radio Service GSM - Global System for Mobile communications HLR - Home Location Register HSS - Home Subscriber Server IaaS – Infrastructure as a Service IMS – IP Multimedia Subsystem ISP – Internet Service Provider LTE- Long Term Evolution MANO – Management and Orchestration MIMO - Multiple Input Multiple Output MME - Mobility Management Entity MMTel - Multimedia Telephony MPLS - Multiprotocol Label Switching MSC - Mobile Switching Center NaaS – Network as a Service NFV – Network Function Virtualization OFDM - Orthogonal Frequency Division Multiplex OFDMA - Orthogonal Frequency Division Multiple Access OMA - Open Mobile Alliance OPEX - Operational Expense PaaS – Platform as a Service PCEF - Policy and Charging Enforcement Function PCRF - Policy and Charging Rule Function PLMN - Public Land Mobile Network POTS – Plain Old Telephone System PSTN – Public Switch Telephony Network QAM – Quadrature Amplitude Modulation RAN – Radio Access Network RCS - Rich Communications Suite RTP – Real-time Transport Protocol SaaS – Software as a Service SBC – Session Border Control

SDP – Session Description Protocol SGSN – Serving GPRS Support Node SIP – Session Initiation Protocol SLA – Service Level Agreement SON – Self Organize Networks SRVCC - Single Radio Voice Call Continuity UA – User Agent UE – User Equipment UMTS - Universal Mobile Telecommunications Service VCC - Voice Call Continuity VLR – Visited Location Register VNF – Virtual Network Function WDM – Wavelength Division Multiplexing

Some more abbreviations related to telecom AAA - Authentication Authorization Accounting ACA - ACcounting Answer ACR - ACcounting Request AKA - Authentication and Key Agreement AoC - Advice of Charge ASA - Abort Session Answer ASR - Abort Session Request BBERF - Bearer Binding and Event Reporting Function BGCF - Breakout Gateway Control Function BTS - Base Transceiver Station CAMEL - Customised Application for Mobile network Enhanced Logic CAP - CAMEL Application Part CCA - Credit Control Answer CCF - Charging Collection Function CCR - Credit Control Request CPM – Converged IP Massaging CSCF - Call Session Control Function DRA - Diameter Routing Agent DTMF - Dual Tone Multiple Frequency EAB - Enhanced Address Book EDGE - Enhanced Data rates for GSM Evolution EIR – Equipment Identification Repository ENUM - E.164 Number Mapping GCID - GPRS Charging IDentifier GIBA - GPRS-IMS-Bundled Authentication GTA - Group Total Allowance IARI - IMS Application Reference ID IBCF - Interconnection Border Control Gateway ICID - IMS Charging IDentifier ICSI - IMS communication service IDentifier IETF - Internet Engineering Task Force IMAP - Internet Message Access Protocol IP-CAN - Internet Protocol Connectivity Access Network IP-SM-GW - IP short message gateway

ISR - Idle state Signaling Reduction" ITU - International Telecommunication Union IWF – Interworking Working Framework LBS – Location Based Service MBMS - Multicast/Broadcast Multimedia Service MGCF - Media Gateway Control Function MMS - Multimedia Messaging Service MRFC - Multimedia Resource Function Controller MRFP - Multimedia Resource Function Processor MSISDN - Mobile Subscriber ISDN Number MSRP – Message Session Relay Protocol NAB - Network Address Book NAS – Non Access Stratum OAuth - open standard for authorization OCB - Outgoing Call Barring OCS - Online Charging System OFCS - Offline Charging System OIR - Originating Identification Restriction PCN - Packet Core network Node (SGSN, S–GW, P–GW) PDF - Policy Decision Function PDP - Packet Data Protocol PS – Presence Server PUID – Public User ID QoS – Quality of Service QCI – QoS Class Identifier RLS - Resource List Server RRC - Radio Resource Control SBCF - Session Based Charging Function SDF- Service Data Flow SGID - Subscriber Group ID SGML - Subscriber Group Member List SIMPLE - Session initiation protocol for Instant Messaging and Presence Leveraging

Extensions SPR - Subscription Profile Repository SSO – Single Sign On TDF - Traffic Detection Function TIP - Terminating Identification Presentation TISPAN - Telecommunication and Internet converged Services and Protocols for

Advanced Networking UDR - User Data Repository USIM - Universal Subscriber Identity Module XCAP - XML Configuration Access Protocol XDM – XML Document Management XML - Extensible Markup Language