Journées Techniques Réseaux 2010 Téléphonie sur IP. Lyon, 14th October 2010

Transcription

1 Journées Techniques Réseaux 2010 Téléphonie sur IP Lyon, 14th October 2010

2 Agenda Motivation Overview Technical architecture ARARA Operations Metrics 2

3 Motivation Let s go back in time to Portugal in

4 Research and Education Network FCCN is a private non-profitable organization founded in January 1987 that runs and manages: Top Level Domain.pt and Portuguese PIX; The Portuguese NREN: > 100 Universities and Research institutions > 1000km Optical fiber One time 2.5Gbps to London One time 10Gbps to Madrid and now manages and supports VoIP@RCTS network! 4

5 Global overview What we had: Multi- brand Legacy PBXs scattered along the country's 32 universities and related agencies. RCTS Network with more than 1000Km of optical fiber interconnecting Universities, Research Labs, and Institutes. 5

6 Set the goal Political statement (2006) Gradual adoption of voice over IP communications [ ], from 2007, for all Public Higher Education Institutions In A Commitment with Science for the Future of Portugal In 2007 FCCN applied for funding to achieve this goal

7 Main goals Establish a VoIP network to interconnect all the legacy systems from Portuguese Universities, using Open Standards like SIP. New users at Universities should be VoIP users, no more investment in proprietary legacy systems. Implement ENUM tree nrenum.net as PoC in partnership with the National Authority Regulator for Telecoms (ANACOM). Migrate TDM circuits from those legacy systems to SIP trunks, interconnecting safely and in a resilient way, with major carriers in Portugal through RCTS network. 7

8 Calendar Jan Nov.2007: Call for interest and information gathering Dec.2007-Apr.2008: Public tender for acquisition of VoIP equipment. Jun.2008 Nov.2008: Public tender to acquire Carrier s VoIP services. Jun.2008: Acquisition of VoIP phones to promote the early adoption of VoIP technology in the Universities. Jun.2008: ARARA Unified Communications Federated Platform (AAI) SIP/XMPP Softphone Mar.2009 Jun.2009: Ported out the first 109 MGWs to Carriers SIP Trunks ~ 20000DIDs. Aug.2009: Monitoring platform using OpenSource software Zenoss, on going since. 8

9 Scope 32 Higher Education institutions (1st phase) 14 Science and Tecnology Agencies (2nd phase) Technical constraints PBX that had less than 250 /month Non ISDN PBX or lines

10 Technical architecture

11 Technical architecture

12 VoIP equipment acquired Per VoIP domain Session Border Controller Mediagateways (one per legacy PBX) IP PBX Accouting, Billing and QoS Report Servers Hardphones: namely Polycom 330, Soundstation 6000 and SNOM

13 At first stage, VoIP only for ENUM calls: Initial setup April 2008 March

14 VoIP services acquired Tariffs based on dialed pattern number, to avoid unexpected costs when dialing to a ported out number. Tariffs based on cost per second from the very first second, to avoid 1st minute charge in shorter calls. Resilient SIP trunks with one of the carriers, implementing crankback mechanisms through TDM backup circuits: one per mediagateway. 14

15 Routing scheme Mobile dest XXXXXXX Mobile dest XXXXXXX Mobile dest XXXXXXX National dest. +351XXXXXXXXX International dest. 00X. Emergency calls like 112 Resilient calls using TDM circuits and crankback mechanisms, inbound and outbound via PT Prime. 15

16 Final Setup Progressively MGW by MGW since March

17 Routing Scheme Both MGWs and ipbxs query 3 enum trees with the following order: e164.arpa, nrenum.net, e164.org. If a proper resolution is found, call procceeds being sent an Invite to outside world through the SBC; otherwise the call routed to right carrier through SIP. As a fallback route there s to establish the call via TDM backup circuits, installed on every MGW. 17

18 Crankback mechanism University s SBC is down: basically if something goes wrong in IP world both infra-structures, carrier and university, automatically route the calls via TDM circuits. 18

19 Crankback mechanism University s MGW is unreachable for the SBC: University s SBC rejects call with 503 Service Unavailable and the carrier cranks back to TDM circuit. 19

20 ARARA

21 ARARA architecture Internet ARARA Pólo A Instituição 1 Pólo B QOS / ENUM Pólo A Instituição 2 Pólo B Telefonia Tradicional Telefonia Tradicional RCTS Telefonia Tradicional Telefonia Tradicional Telefonia IP Telefonia IP Redes públicas

22 Operations

23 Each institutions has a maintenance contract with vendor We provide: 3rd line assistance Operational procedures Advisory Trainning New features broker Monitoring

24 Call Logs 24

25 Call Detail Records call logs and call statistics are mandatory to troubleshoot any IP Telephony infra-structure! 25

26 Monitoring TDM circuits 26

27 Current metrics Description Universities and Agencies Total Total DIDs Total DIDs ported out to SIP Trunks DIDs populated on nrenum.net Average cost reduction with Voice services per University Busy Hour Traffic to landline calls 43 scattered along 240 sites 28500~95% 23400~78% 48% 40Mb/s ~400 Simult. Calls (Alaw) 27

28 Questions? 28

29 Thank you! 29