VoIP VoIP 2003 2003 9 10 1
IP VoIP VoIP 11301J101
VoIP(Voice over Internet Protocol) VoIP IP IP IP 3
1. IP 2. VoIP 3. QoS 4. IP 4
IP IP 5
1.1 IP IP IP IP VoIP VoIP 6
1.2 IP - - - - - 7
1.2 IP - - - - 8
1.3 IP H.323-1996 ITU-T(InternationalT(International Telecommunication Union Telecommunication standardization sector [ ]) - - - 9
1.3 IP - IP - - 10
1.3 IP SIP (Session Initiation Protocol) - 1999 IETF(Internet Engineering Task Force [ ]) - IP - - HTTP FTP FTP 11
1.3 IP H.248 / MEGACO (MEdia( GAteway COntrol) - 2000 ITU-T IETF - 1999 IETF MGCP - IP MGCP(Media Gateway Control Protocol) - IP IP 12
VoIP 13
2.1 SIP SIP(Session Initiation Protocol) 1999 IETF H.323 IP HTTP FTP FTP OSI 14
2.1.1 SIP UA(User Agent) SIP - UAC(User Agent Client) - UAS(User Agent Server) (proxy server) (redirect server) UA UA (register server) UA SIP (location server) UA UA UA 15
2.1.1 SIP IP UAC / UAS UAS / UAC SIP 16
2.1.2 SIP SIP - SIP - - (UAC) (UAC) (UAS) - UAS UAC UAC 17
2.1.2 SIP (method) INVITE ACK CANSEL BYE OPTIONS REGISTER INFO UAC UAS UAS INVITE 100 Trying 180 Ringing 200 OK 400 Bad Request 18
2.1.2 SIP SIP SIP (IP ) SIP REGISTER 200 OK SIP 19
2.1.2 SIP UAC SIP ( ) UAS INVITE INVITE 180 Ringing 180 Ringing 200 OK 200 OK ACK ACK 20
2.1.3 SIP OSI 7 6 5 SIP (Session Initiation Protocol) 4 TCP SDP (Session Description Protocol) SAP (Session Announcement Protocol) 3 IP RTSP (Real-Time Streaming Protocol) UDP 2 IntServ DiffServ DiffServ 1 RTP / RTCP (Real-time Transport [Control] Protocol) 21
2.1.3 SIP SDP(Session Description Protocol) - - SIP - SAP(Session Announcement Protocol) - - 224.2.127.254:9857 SDP SDP 22
2.1.3 SIP RTP / RTCP (Real-time Transport [Control] Protocol) - H.323 SIP SIP RTP - - RTCP - - RTSP (Real-Time Streaming Protocol) - 23
2.2 ENUM IP ISP ENUM(tElephone NUmber Mapping) - DNS URI(Uniform Resource Identifier) - - URI TCP/IP URL(Uniform Resource Locators) 24
2.2.1 ENUM E.164 - ITU-T E.164 ENUM ENUM 11 15 1 3 CC NDC (15 CC) SN +81-3-1234-5678 03-1234-5678 25
2.2.2 ENUM IP ENUM DNS IP SIP DNS ENUM DNS SIP IP URI DNS SIP URI IP SIP SIP IP URI DNS IP IP SIP IP 26
2.2.3 ENUM E.164 IP E.164 +81-3-1234-5678.e164.arpa 8.7.6.5.4.3.2.1.3.1.8.e164.arpa arpa : Address and Routing Parameters Area ENUM DNS ENUM DNS URI URI sip:sally@.co.jp DNS URI DNS IP IP 172.0.0.1 27
QoS 28
3.1 QoS QoS(Quality of Service) - - IP - 29
3.2 IP (delay) - (echo) - - IP ( ( jitter) - (packet loss) - UDP/IP 30
3.3 QoS (policing) - (flow control) - Intserv(Integrated Service) - End to End Diffserv(Differentiated Service) - IP 31
IP 32
4.1 IP IP - VoIP VoIP - - IP - 33
4.2 VoIP (1) - - CTI(Computer Telephony Integration) - IP - 34
4.2 VoIP (2) IP - LAN LAN LAN LAN IEEE802.11b(11g) IEEE802.11b(11g) IP IP - PDA(Personal Digital Assistant) PC 35
36
H.323 1996 ITU-T version1 IP IP IP IP VoIP 2003 version5 37
H.323 (EP[End Point]) (MCU) (GW) IP (GK) 38
H.323 (zone) (zone) H.323 MCU MCU H.323 EP GK IP GK EP EP EP GW GW 39
OSI H.323 7 AV 6 H.225.0 H.245 H.225.0 G.711 H.261 5 (Q.931) H.225.0 (RAS) (RTCP) H.225.0 (RTP) 4 TCP 3 IP UDP 2 LAN / WAN Ethernet 1 40
H.323 1. 2. 3. 4. 41
1. 1. H.323 - GK GK GK GK H.225.0(RAS) GK (GK) GK IP 42
2. H.323 2. - H.225.0(RAS) GK - GK IP - H.225.0(Q.931) (SETUP) (SETUP) - GK GK (ALERTING) (ALERTING) (CONNECT) 43
3. 3. H.323 - H.245 (negotiation) (negotiation) (negotiation) - (capability exchange) - (master slave determination) - (open logical channel) - H225.0(RTP/RTCP) H225.0(RTP/RTCP) 44
H.323 4. - H.245 H.245 - (RELEASE (RELEASE- COMPLETE) H225.0(Q.931) H225.0(Q.931) - GK GK (DRQ[Disengage ReQuest]) ]) GK (DCF[Disengage ConFirmation]) ]) 45
MGCP MGCP(Media Gateway Control Protocol) 1999 1999 IETF RFC2705 IP IP SIP OSI UDP/IP UDP/IP 46
MGCP (softswitch softswitch) - IP IP CA(Call Agent) - IP - CA CA GW MGCP 47
H.248 / MEGACO MGCP 2000 ITU-T H.248 IETF IETF MEGACO RFC3015 IP GCP(Gateway Control Protocol) IP IP 48
H.248 / MEGACO MGC(Media Gateway Controller) - IP IP TGW(Tranking GateWay) - IP IP SG(Signaling Gateway) - SS7 IP CA SS7 SG MGC SG SS7 GCP IP TGW IP TGW 49