IRT Lab IP Telephony Columbia 1 Henning Schulzrinne Wenyu Jiang Sankaran Narayanan Xiaotao Wu Columbia University Department of Computer Science.

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Presentation transcript:

IRT Lab IP Telephony Columbia 1 Henning Schulzrinne Wenyu Jiang Sankaran Narayanan Xiaotao Wu Columbia University Department of Computer Science

IRT Lab IP Telephony Columbia 2 IP Telephony and Protocols External line PBX Corporate/Campus Internet LAN PBX Another campus LAN IP Phone Client/ Audio over RTP VoIP Gateway home.com office.com SIP server SIP server Call

IRT Lab IP Telephony Columbia 3 Architecture SIP proxy, redirect server SQL database sipd SIPH.323 convertor NetMeeting sip323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP SIP conference server sipconf T1/E1 RTP/SIP Telephone Cisco 2600 gateway Telephone switch Web based configuration Web server Cisco Com e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Pingtel SNMP

IRT Lab IP Telephony Columbia 4 CINEMA: Columbia InterNet Extensible Multimedia Architecture Web interface –Administration –User configuration Unified Messaging –Notify by –rtsp or http Portal Mode –3 rd party IpTelSP

IRT Lab IP Telephony Columbia 5 PSTN-IP Inter-Operation PBX PSTN External T1/CAS Regular phone (internal) Call SIP server sipd Ethernet 3 SQL database => bob sipc 5 Bob’s phone Outgoing calls are similar Gateway Internal T1/CAS (Ext: ) Call

IRT Lab IP Telephony Columbia 6 sipc – A SIP User Agent

IRT Lab IP Telephony Columbia 7 Controller SIP Stack Transmission Controller SIP Stack Transmission Service Logic Execution Environment CPL script CGI script Service Creation Environment Service Logic Execution Environment CPL script CGI script Service Creation Environment GUI Media transmission Media application Media application sipc Architecture

IRT Lab IP Telephony Columbia 8 What about Audio Quality? Voice Codec: G.711 = toll quality at 64 kb/s Bandwidth: rarely an issue on campus networks with Gigabit core switches Measurement in the Columbia intranet (campus- wide), over a total of 24 hours –Average (one-way) delay < 1ms –Jitter: packets > 10ms = 0.003%-0.05% –Loss: 0.001%-0.01%, 0.005% average Using Ethernet switches instead of hubs prevents excessive delay/jitter.

IRT Lab IP Telephony Columbia 9 Scalability, Security and Other Scalability based on multiple servers: –SIP Server, via DNS SRV –Gateway and LAN bandwidth –Media servers (voic and conferencing) Security: –Authenticate users; Disallow auth-bypass. –Gateway calls for only authorized users. Further issues of study: –Service availability/reliability, QoS –Privacy/encryption, Electronic Billing