JINR’s PBX DEPARTMENT Chepigin A.V., Litnitcky M., Polyanskiy N. NEC-2011, Varna, Bulgaria

Coordinate automatic telephony station: Total ports – 5500, Subscriber ports - about 4200, Corporate subscribers (JINR) - about 3800 subscribers One of the oldest automatic telephony station in Dubna Moral and technological obsolescence of the equipment High expenses for service and operation Unable to realize modern communication functions and additional services Technical issues of interconnection to other communication service providers Sharply increased quantity of failures on the main cable lines to subscribers Preconditions to start the project of PBX equipment modernization (coordinate telephony station) (autumn, 2010)

Main tasks for the first stage Impossible to disconnect subscribers from communication, even for 1 day (excepting failures) Absence of digital E1 interface with the upper operator (Rostelecom) Absence of digital interfaces in old PBX, no direct interfaces Any changes in coordinate station require to sold the wires – time and labor-consuming works Temporary solutions: Installation Е1-3CL (analog connection line) multiplexor units to get an Е1 interfaces (60 in / 60 out slots)

Analog 3CL to E1 int. Multiplexing units Produced in 1974 coordinate PBX, 250 sq. m., ~8 kVa power

First stage results and solutions Construction the first stage of the digital automatic telephony station (PBX), 1000 wired subscribers New wire cross for 1000 subscribers is installed Real time switching 1000 subscribers from analog to the digital PBX, with less then 1 hour switch-off period Additional equipment installation: SIP-GSM gateway to connect GSM networks (4 lines) IP-E1 Gateway Construction an additional PBX on LHE zone for 400 (up to 800) ports, using the optical communication line and multiplexers to connect with master PBX. 8xЕ1 interface interconnections by V5.2 protocol realized. During the summer of 2011, a new optical communication line from JINR’s PBX-6 to PBX-217, for the transit access to Rostelecom platform was built.

Digital local PBX station, as a part of PBX-216, based on LHE zone Connected subscribers: today: 230 today: 230 by October, 1 st : 400 by October, 1 st : 400 by the end of the year: 700 (all fixed numbers) by the end of the year: 700 (all fixed numbers)

In June 2011, we have install the digital PBX “Eltex MC240” (developed and produced in Russia) Stack-based PBX telephony platform, up to ports The powerful switch for real time E1 streams operations (2х16 Е1) Integrated TM.IP unit, as a part of PBX, allows: Direct support SIP users SIP-gateways for 4-72-… subscribers Multiplexer units for E1 over FO interconnections SIP-GSM gateway IP-E1 gateway

Main benefits of this solution – “MC 240” digital PBX Reliability, robust, adapted to the specific Russian conditions Don’t need to “pay for license to activate any options” Ready for modernization Operative technical support by vendor Ready for add-ons Has built-in support of Voice over IP (VoIP) using SIP protocol Online monitoring The centralized management Price – ~ 45 USD by 1 port

What we can do now Main cable failures between “master PBX” and subscribers could be solved by using “local PBX” devices, installed in buildings, over IP/FO transport. To reduce expenses for international calls using a pool of alternative operators with lower prices Direct interconnection with local operators, for traffic and expenses optimization (an exchange of the local telephone traffic) Subscriber management (billing, statistics) Online monitoring: subscriber's ports, line condition diagnostic

Current status Pre-production digital PBX’s operation for on 1400 subscribers Preparing to switch users from analog to digital platform Interconnection to the upper operator by E1 streams Successful experience of SIP-gateways installation in non- telephoned buildings (fixed 6xxxx numbers) Interconnection between PBX-6 and PBX-217 by E1 int. Interconnection to Moscow operator for 495/499 multichannel lines Interconnection with GSM network (corporate MTS numbers) Real solution for LHE zone of JINR, construction in progress Many obstacles and barriers from Regulatory Agency

PBX-216 links

Why not only SIP users in JINR without any wires? SIP is better and easy to implement & manage BUT: JINR network not always allows to auto provision SIP phones SIP phones are useless without power supply Price: USD for VoIP phone device Have your own Skype like service under your total control and integrated with local resources Use open source SIP tools (OpenSIPS, FreeSWITCH, SipXecs, Asterisk) Give your users amazing telephony features with full self control Peer!!! Interconnect directly with other institutions SIP is the future! Why Skype? Use SIP!

SIP and fixed subscribers of the PBX-216

SIP peering and interconnections between JINR and other organizations

Perspectives By the end of the year 2011, try to finish installation of 3000 numbers as a whole By the end of the year 2012, construct the digital PBX on full capacity – 5600 subscribers Try to suggest for international collaborations in JINR more cheaper telephone services Using regular and VoIP solutions, provide the telephone services to private clients, including JINR employees and the organizations in the city of Dubna.

Questions?