b site From, 138 RFCs, 221 Record-Route, 139-140 Route, 139-140 SIP information, 221, 223 Via, 142 working groups, 48-49 Index IGMP (Internet Group Management internetworking, PSTN-to-SIP, 204 Protocol), 68 extensions, 210 IMAP (Internet Message Address gateways, 206-209 Protocol), 56, 59 message bodies, 211 implementing SIP UAs, 100 PINT, 213 IMPP (Instant Messaging and Presence interoperability events, 94 Protocol), 199 INVITE requests, SIP transactions, IN (Intelligent Network) services, 24-25 119-120, 145 in-band signalling, 11 INVITE responses, SIP transactions, 146 INAP (Intelligent Network Application IP (Internet Protocol) Protocol), 24 3G mobile systems, 193-094 INFO method, instant messaging, 212 connections, 37-39 informational RFCs, IETF, 51 DiffServ PHBs, 79 instant messaging integrated services, 75 3G mobile systems, 199 multimedia domains, 193-194 INFO method, 212 QoS, 74 MESSAGE method, 200-201 reservation merging, 76 SIP extensions, 171, 200 soft states, 78 SUBSCRIBE/MODIFY framework, 200 state information, 76 integrated services, IP, 75 statelessness, 39 interactive services, 61 IPTEL (IP Telephony) working group, 48 Internet IRG (Internet Research Group), 46 application layer, 56-57 IRTF (Internet Research Task Force), 47 architecture, 56 ISDN (Integrated Services Digital coordinating bodies, 46 Network), 2 differences from PSTN, 25 ISOC (Internet Society), 47 drafts, 52 ISPs (Internet Service Providers), 27 interactive services, 61 ISUP (ISDN User Part), 23 Mbone, 70 supplementary services, 24 multicasting films, 87 user plane, 27 multimedia services, 61 IVS (INRIA Videoconferencing System), 91 real-time services, 59 reliability, 26 streaming services, 59 TCP/IP protocol suite, 56 transport layer, 56-58 Index mobility of users, 96 MSCs (Mobile Switching Centers), 26 jitter, 71 MTA (Multimedia Terminal Adaptor), 203 load balancing, routing, 32 multicast conferences, 215 Local Battery systems, 9 multicast routing, 62 local exchanges, 5 advantages, 64 local loop, 15 protocols, 65-66 location serv