ion dial-in user service ratio access bearer RANOS radio access network operation support radio base station request for comments Glossary xxvii routing information protocol radio link control radio network controller return on investment return on capital employed robust header compression ratio link control resource reservation protocol RSVP-TE RSVP - traffic engineering R-SGW roaming signalling gateway real time control protocol round trip delay real time protocol real time streaming protocol round trip time SIM application toolkit session description protocol supply chain management service control point service capability server stream control transmission protocol synchronous digital hierarchy service description protocol serving GPRS support node signalling gateway SHDSL single pair high bit rate digital subscriber line SIGTRAN signalling transport (working group) subscriber identity module session initiation protocol strategy, infrastructure and product service level agreement service level specification small and medium enterprise S/MIME secure multipurpose Internet mail extensions short message peer-to-peer protocol short message service simple mail transfer protocol simple network management protocol simple object access protocol small office/home office service-oriented programming SONET synchronous optical network stored program control security parameter index structured query language xxviii Glossary signaling system No 7 secure shell service set identifier secure socket(s) layer storage service provider service switching point 1.544 Mbit/s transmission capability/rate/facility/path traffic condition agreement transaction capabilities application protocol time division duplex (fig 13.28/13.29) time division multiplex time division multiple access TD-SCDMA time division - synchronous code division multiple access traffic engineering telephony server transport layer security telecommunications network, telecommunication management network telecom operations map type of service tools for radio access 