Presentation on theme: "VoIP at the University of Oregon The View from the Telephone Side Dave Barta, University of Oregon"— Presentation transcript:
VoIP at the University of Oregon The View from the Telephone Side Dave Barta, University of Oregon firstname.lastname@example.org
VoIP Applications Two Distinct Evaluations Voip in the backbone –OPX replacement –Tandem networks Telephone switching systems to the desktop
OPX Replacement Locations Oregon Institute of Marine Biology (OIMB) – 100 miles from Eugene in Charleston, OR Pine Mountain Observatory –200 miles east –Over a major mountain range –19 miles from nearest paved road Future locations in local area
OPX Replacement - OIMB 2 analog ext. off UO PBX - 5 digit dialing Trunk group in OIMB key system –Dial Access Code (DAC) + 5 digits –Tail End Hop Off (TEHO) in OUS Cities –LD Access Rides US West frame relay T1 –$450/month – Relatively low traffic
OPX Replacement - OIMB (cont.) Replaces one Off Premises Exchange line (OPX) @$250/month No signalling except supervision No compression (G.711) Quality accptable (but noticeable difference) 2 LEC service areas - GTE, USWest
OPX Replacement - Pine Mountain Like OIMB except two phones instead of key system. No OPX before - calls to campus LD. No access to dedicated LD services. Served by T1 frame relay circuit dropped from microwave tower on same mountaintop.
OPX Replacement - Local Remotes Rate changes creating advantageous climate –T1 @$300/mo. –DSL over 4-wire LADs @$48/mo., but possibly going to $200/mo. –OPX @$31.50/mo., but possibly going to $84/mo. In use at staff homes Contemplated for other off campus offices
VoIP to replace OPX is simple because: Usually no DID (although fairly simple with E&M tie trunk interfaces) No need for complex call accounting No or simple voicemail requirements Simple PBX translations Voice bandwidth requirements minimal
VoIP in the OUS Tandem Network Challenging Interesting Cost Effective (probably)
The Oregon University System voice network connects: 3 semi-large universities: –UO, OSU, PSU –All in the Willamette Valley 4 small regional universities: –WOU, SOU, EOU, OIT –Geographically remote OHSU - Public corporation in Portland
OUS ETN history and culture 1988 - Contract with AT&T –8 PBXs - Sys 85-G2-G3 –Dorm phones for LD resale –Copper and multimode fiber backbones –Voicemail - Audix - Intuity –ETN network and NOC 1992 - H.320 video and MCU 1998 - Y2K upgrades to G3, Intuity, misc. systems Intelcom Committee sets policy Equivalent systems across OUS, with exceptions Funding model subsidizes regional universities
OUS ETN consists of: Multiple ISDN-PRI hubbed to OSU AT&T SDN long distance from large universities w/ small schools using OSU SDN Video MCU at OSU - multipoint H.320 video or voice and w/ upgrade H.323 gateway and multipoint Shared CMS - ACD and trunking management statistics Fault reporting - receives system alarms, filters based on severity, and pages support staff NOC staff Call accounting
ETN features: 5-digit dialing between campuses - shared # plan DCS - passes name info, answer and disconnect supervision SDN access for regional universities Networked voicemail - name, # in message header TEHO - Tail end hop off in each metro area H.320 video between schools and to MCU Reliability and stability
Forces of Change: Cost Factors –Long point-to-point T1s to EOU, SOU, OIT –384K H.320 video and voice traffic forced T1 #2 Opportunity factors –Available OWEN bandwidth in backbone –SDN rates dropping –LD market competition Technological advances –Compression- Reliability –Features (signalling)- Standards
ETN Replacement Options: ISDN-PRI SDN - Add SDN to regional schools and use it for LD, TEHO and (with QSIG) for all ETN functions VoIP to some or all schools w/ or w/o QSIG, depanding on vendor solution Hybrid Solution - VoIP in the Valley, ETN or SDN in the hinterlands
Major Assumption: All existing features will be maintained or improved
Challenges Bandwidth limited on frame circuits to regional universities –At cheap frame price may be worth adding frame circuits just for voice except… –US West CIR unreliable Support for DCS signaling just emerging –Cisco to support some sort of signalling soon –Lucent proprietary solution to packetize signaling information over IP network whether voice is IP or ETN
Other Issues Call accounting - on-net/off-net pricing based on PBX trunk group, so not a problem Video support –H.320 much easier with ETN network than SDN or 700 number option for schools without PRI trunking –Move to H.323 will help but H.320 still growing Voice Quality - difference is noticeable, but meaningful?
Other Issues (cont.) Control –Telecom is sole owner and user of ETN network (except for AT&T, US West, GTE, and PTI, of course) –Using OWEN introduces many more interested parties and we would, for now, be the only isochronous app. –SOEN/state politics - network ownership is a political issue which goes outside of higher ed. Complexity - more hardware, more protocols, more people, multiple alarm platforms
Other issues (cont. again) Installation cost –PBX cards –Router ports/cards –Possibly more SDN or frame circuits –Time and energy Remote maintenance –PBXs dont support IP access for maintenance and troubleshooting - modem or on-net EIA only –If/when IP maintenance access, security becomes an issue
Experimentation Cisco solution without signalling –T1 from PBX to Cisco router at UO and OSU –Discrete trunk group with manual DAC access –QOS available but not necessary –Voice great at G.711, noticeable difference at G.729(a) –No fax or modem support –DID capability
Experimentation (cont.) Lucent Internet Telephony Server (ITS) –Outboard NT Server w/ T1 interface to PBX –DID but no DCS –Good voice, fax support –No compression –Ping and measure delay on call setup and give busy if too much, but otherwise no QOS
Future Developments Cisco to support signaling – Were experimenting Lucent –ITS replaced by inboard 3 slot card - G3V7 –3 slot card replaced by one slot card - G3V8.1 –Support QOS via precedence bit - G3V8.2
VoIP to the Desktop What we have - What the users want Lucent Definity G3 V7 PBX –7,000 stations, 550 PSTN trunks, –5 T1 to AT&T for SDN, TSAA, 0+ –3 T1 to ETN network Features Supported –Extensive alarm reporting –Call coverage off-net and back –The usual pickup, park, transfer, + 6-way conf.
PBX features (cont.) –ACD call centers w/ realtime, summary reports –Integrated and networked voicemail –Multiple sets from POTS to 36-button display –Supports wireless integration –Caller ID (# only) on digital sets and analog (v8.2) –Legacy applications - alarms, modems, faxes, emergency phones, elevator phones –ISDN-BRI
Experimenting with IP Phones Purchased Selsius Trial Pack –6 sets used consistently on campus –Sets to remote locations One at OSU via Owen - worked fine Took one to SLCC and used over congested commodity internet - that was cool and useful OSU to try same trick with telecommuter in Phoenix - a potentially useful application. –Simple programming interface –Limited feature set –Lots of IP PBX rebooting –g.723(1) did not pass muster
Issues/obstacles to real implementation Full feature set, array of telephone sets, and set cost Redundancy/reliability in controllers and core routers Distributed architecture means distributed backup power - $ and space e911 - solvable at the expense of mobility Voice quality - compressed voice IS different, but does it matter?
My opinion Seriously viable in small locations –Reduced feature requirements –Consolidated closets so power not an issue –Usually not fully integrated with campus voicemail, etc. so not an issue –Price will decide Soon a good option on a campus without an existing cable plant
Last few opinions Wouldnt want to be facing a PBX decision right now - cutting a large PBX is hard enough without it being a beta test PSTN response important –IP or some packet approach would reduce expensive SONET gear –Its time for compression –IP to PSTN breaks their pricing model to our advantage Hybrid of traditional telephony, IP, wireless