SIP Basics - Massachusetts Institute of Technology
VoIP at MIT Merit VoIP Seminar Dennis Baron April 3, 2008 np163 Dennis Baron, April 3, 2008 Page 1 Outline MIT VoIP Project Goals VoIP Service Models VoIP Architecture Rollout Plan Outstanding Issues Quick Questions np163 Dennis Baron, April 3, 2008 Page 2 Voice over IP Project Goals Smoothly migrate MIT to Voice over IP (VoIP) with minimal impact to the end user community; determine optimal timing for the transition
Highly robust, carrier class infrastructure Roll-out plan developed in coordination with departments, labs, and centers: site surveys of existing telephony services scheduled migration Deployment support models from intensive & local hands-on by IS&T to cooperative support for DLC IT staff. np163 Dennis Baron, April 3, 2008 Page 3 Voice over IP Service Model Provide a flexible infrastructure for MIT faculty, students, and staff. MITvoip managed enterprise service for most users Focus on desktop phone replacement Robust, reliable, and secure Scalable and supportable Voice only service PersonalSIP accounts for everyone Self-service activation Based on your MIT electronic identity ie. email address Open standards environment allowing members of the community to experiment
And maybe something else in between np163 Dennis Baron, April 3, 2008 Page 4 VoIP Service Spectrum MITvoip Basic Functionality IP Phone Users Operates like ISDN phone New VMail @ old VMail No / little training required Full Support Personal SIP Accounts SIP account only BYO Phone, Client or Application Telephone number assigned Limited (5 digit) outbound dialing Limited IS&T Support, Peer Support Advanced Functionality Advanced user functions via Sylantro web pages Flexibility for early technology adopters Options for building SIP applications
np163 Dennis Baron, April 3, 2008 Page 5 Desktop Replacement Service MITvoip Polycom for desktop devices SoundPoint IP430, 550, and 650 Soundstation IP4000 conference phones Hitachi Cable WIP5000 WiFi phones Sylantro for call control Iperia for voice mail Covergence for Session Border Controller (SBC) Media and signaling encryption Currently out of service Home grown provisioning system np163 Dennis Baron, April 3, 2008 Page 6 PersonalSIP Accounts Based on pilot/open source infrastructure OpenSER and Asterisk
Bring your own device Soft clients (applications) that run on Windows, Macs, Linux, mobile devices Phones & soft clients that support video Modified support model Limited IS&T support Peer support: wiki and user forums Leverages Mobile Partners Allows for experimentation Greater flexibility lesser reliability Features may evolve over time Encourages innovation np163 Dennis Baron, April 3, 2008 Page 7 Long Term VoIP Architecture 5/9/2007 ~ 1-2,000 Open Source? ~ 13,000 IP-Centrex
~ 2,000 Analog Telephone Lines Emergency Phones Modem, point of sale, alarms, etc. Session Border Controller (SBC) Internal Access (Line Side) Shared Services SYL Presence Server Location dB Outbound Proxy Pilot:openSER ENUM (DNS) External
Access (Trunk Side) Internal (routing) Proxy Fax PBX .. SYL Server Syl Control Presence (feature server, Server registration dB) SYL SYLRoute RouteServer Server Pliot: openSER Messaging
(Iperia) Other Shared Services (conferencing, presence, etc.) VoIP Gateways DMZ SBC Carrier SBC Pilot:Cisco 5850 New VoIP Platform Pilot Platform Public IP PSTN New Analog Platform np163 Dennis Baron, April 3, 2008 Page 8
VoIP Rollout Plan SIP experimentation started in 2003 VoIP pilot in 2007 Phased deployment began in January 2008 13,000 - 15,000 phones to be transitioned Rollout to take ~ 2.5 years Deployment criteria: New construction (no telco wiring) VoIP Pilot groups (partially transitioned) Building renovation or group move Buildings with adequate infrastructure (wiring, data closets, etc.) Department readiness np163 Dennis Baron, April 3, 2008 Page 9 VoIP Project Timeline Feb-07 Apr-07 2/1/2007 Jul-07 Oct-07
Jan-08 Apr-08 VoIP Pilot July-08 Jan-10 1/1/2010 6/30/2008 4/1/2010 Jul-10 7/1/2010 Transition Plan Infrastructure Development SBC Deploy Personal SIP Accounts Personal SIP Accounts Migrate VMail inc 5E OPTIN
Pilot Server Migration Full VoIP Deployment Full VoIP Deployment FY 3Q08 1500 phones FY 4Q08 1500 phones np163 FY 3Q10 1500 phones FY 4Q10 1500 phones Dennis Baron, April 3, 2008 Page 10 Outstanding Issues Limited support for VoIP over WiFi Currently no guarantee for quality of service No ability to centrally configure and manage handsets
Capabilities expected to change over the life of the service Service delivery model for non-IS&T campus networks Service level agreements, phone configuration and initialization, emergency services/endpoint location, and quality of service Evolving ability to support emergency services (100/911) Using network data to self-report IP phone location. Need for additional analog phones (key offices and hallway placement) in the event of power and/or network outages Whether to provide a student VoIP service offering Parity with existing telephony service offering np163 Dennis Baron, April 3, 2008 Page 11 Questions? np163 Dennis Baron, April 3, 2008 Page 12
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