Towards Junking the PBX: Deploying IP Telephony. What is a PBX?
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1 Towards Junking the : Deploying IP Wenyu Jiang, Jonathan Lennox, Henning Schulzrinne and Kundan Singh Columbia University {wenyu,lennox,hgs,kns10}@cs.columbia.edu We describe our departmental IP telephony installation What is a? Corporate/Campus Private Branch Exchange External line Telephone switch Another switch 704 Corporate/Campus LAN Internet 1
2 What is IP? Corporate/Campus 7040 Another campus External line LAN Internet LAN IP Protocols Call SIP home.com office.com Session Initiation Protocol - SIP Real time Transport Protocol - RTP Contact office.com asking for bob Locate Bob s current phone and ring Bob picks up the ringing phone Send and receive audio packets 4
3 Architecture Telephone Telephone switch onf SIP conference rtspd RTSP media sipum SIP/RTSP Unified messaging RTSP Quicktime RTSP clients Web based configuration T1/E1 RTP/SIP Cisco 600 gateway SIP proxy, redirect e*phone Web Hardware Internet (SIP) phones sip NetMeeting Software SIP user agents SIPH. convertor H. Example Call Bob signs up for the service from the web as He registers from multiple phones Alice tries to reach Bob INVITE canonicalizes the destination to rings both e*phone and Bob accepts the call from and starts talking Web based configuration Call Bob SIP proxy, redirect e*phone Web cs.columbia.edu Hardware Internet (SIP) phones Software SIP user agents 6
4 Other Services Programmable s Time-of-day, caller identification CPL,SIPCGI Unified messaging Centralized voice mail and answering machine SIP,RTSP Conferencing Dial-in bridges; centralized audio mixing Audio, video and chat 7 PSTN to IP Call PSTN External T1/CAS Internal T1/CAS (Ext: ) Gateway 1 Call Call x is called a part of Coordinated Dial Plan (CDP) in a Nortel Regular phone (internal) Ethernet DID - direct and simple No-DID - dial extension, supports more users Bob s phone SIP => bob 8 4
5 IP to PSTN Call PSTN External T1/CAS Call 11 Internal T1/CAS Call Gateway (10.0..) Ethernet 11 Regular phone (internal, 704) 1 Bob calls 11 SIP Use sip:811@ T1 Line Configuration (Fromthe Side) Electrical/physical settings T1type:Channelized,PRI Characteristics: line coding - AMI, B8ZS; framing -D4,ESF Trunk type: DID, TIE Channel type: Data, Voice-only, Data/Voice Access permissions: adjust NCOS for internal T1 trunk and CDP routing entry (71x) 10
6 Security Prevent unauthorized users from making certain (e.g., long-distance) calls IOS access control SIP authentication Future: PIN numbers for telephone users Automated, electronic billing 11 Conclusion and Future Work Initial field test experience with deploying IP telephony in a campus environment The architecture and installation experience can be used at other organizations Future Work: Additional services, e.g., instant messaging, VoiceXML Performance and scalability:, rtspd, onf Firewall/NAT, SNMP 1 6
Towards Junking the PBX: Deploying IP Telephony
Towards Junking the PBX: Deploying IP Telephony Wenyu Jiang, Jonathan Lennox, Henning Schulzrinne and Kundan Singh Department of Computer Science, Columbia University 1214 Amsterdam Ave, Mail Code 0401
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