以嵌入式系统开发SIP网路电话伺服器平台.pptx

OUTLINESIP OverviewEmbedded OverviewSpecificationImplementation and MethodVerification1.SIP OVERVIEWFeatures and benefit：1.Simplicity2.Scalability3.Distributed functionality4.Internet-enabled2.EMBEDDED OVERVIEWSOC platform is Creator PreSOC Development Kit.CPU is 32-bit ARM7TDMI network processor S3C4510B,Advance RISC Machines(ARM)macro-cell.Bootloader is similar with BIOS.OS is uCLinux(about 800kBs).2MB Flash ROM and 16MB SDRAM3.SPECIFICATIONPlug and Play and easy to installPlaced on WAN module SIP(RFC3261)/UDP/IPMaximum terminal users：250(0,1,2,3,4,255 is reserved)Flow control mode：Stateless modeServers type：Registrar(RS),Location(LS),Redirect(RDS),User Information Database(UIDB)Method：REGISTER,INVITECode：200,302,400,6003.SPECIFICATION(cont.)(cont.)Main addressing：SIP URI AUX.Addressing：IPPlayers：Caller,Callee,Server,UACDisplay executing status on LCDClient Signaling Control Protocol：SIPClient Voice Data Transfer Protocol：RTPClient User interface：Graphic,one click,user friendly,customized,music ringing.4.IMPLEMENTATION4.IMPLEMENTATION(cont.)This figure shows each method corresponding to exactly SIP server.4.IMPLEMENTATION(cont.)PC A1Eth0192.168.1.20CS、SSPC B1Eth0192.168.1.15CS、SSSIP Proxy Server A include NAT Server Eth1 SS GW192.168.1.1Eth0 CS140.130.32.73SIP Proxy Server B include NAT Server Eth0 SS140.130.32.74Eth1 CS GW192.168.1.1LANHUB AHUB BRTP Session port:9000Signal controlMedia transportCS:Client SocketSS:Server SocketGW:GatewayWANNATNATMake use of NAT Server in Linux OS create a test platform with SIP UACF1:sendInv()F2:forwardto_Proxy()F3:forwardto_Client()F4:sendResponse_200OK()F5:sendResponse200Ok()F6:ReceiveResponse200OK()SIP-UAC:Client ASIP Proxy Server ASIP Proxy Server BSIP-UAC:Client Bpc15.im.nfu.edu.twim.nfu.edu.twae.nfu.edu.twpc13.ae.nfu.edu.twIP:192.168.1.20IP:140.130.32.73IP:140.130.32.74IP:192.168.1.15D1D2D3D4D5D64.IMPLEMENTATION(cont.)The function flow chart of invite action in SIP proxy Server4.IMPLEMENTATION(cont.)Display a SIP User Agent Call4.IMPLEMENTATION(cont.)The browser function of UACUse the SIP User Agent CallThe SIP message on display in SIP Server4.IMPLEMENTATION(cont.)5.verificationThe SIP Header content of caller5.verification(cont.)The SIP Header content of calleeIt is time to demoThanks for your attention.