se multipurpose Internet mail extensions MM/IP multimedia over IP multimedia messaging service managed object MPEG-1 layer 3 mobile positioning centre Motion Picture Experts Group multi-protocol label switching media resource function media resource function control mobile switching centre MSISDN mobile station international ISDN number multi-service network management service provider mobile satellite service fig 13.28/13/29 managed security services provider mobile terminal mobile virtual network enabler mobile virtual network operator network access server network address translator network element next generation network NGOSS new generation operation support systems National Institute of Standards and Technology network maintenance/management centre net present value orthogonal frequency division multiplexing Open Market Alliance operation and maintenance centre object oriented programming operating expenditure open systems interconnection open systems architecture open shortest path first Glossary OSPF-TE OSPF traffic engineering operation support system over the air optical cross-connect person-to-content peer-to-peer person-to-person push access protocol PABX, PBX private automatic branch exchange pulse code modulation personal digital assistant PDP (context) packet data protocol (context) personal digital communication packet data convergence protocol (fig 5.14) packet data protocol packet-data service node peer group peer group identifier peer group leader pretty good privacy per hop behaviour public key infrastructure public land mobile network private network-network interface point of interconnect post office protocol plain ordinary telephony service point-to-point protocol push proxy gateway point-to-point tunnelling protocol packet switching capability personal service environment management public-switched telephone network personal trusted device particular (fundamental) technical plans photonic cross-connect Quality of Service Quantitative assured media playback service RADIUS remote authenticat