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SIP deployment in LEARN

Nimal Ratnayake<nimalr@learn.ac.lk>

Technical Manager, Lanka Educational and Research Network (LEARN)

Senior Lecturer, Department of Electrical & Electronic Engineering, University of Peradeniya

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Introduction

• LEARN: Lanka Education and Research Network

• Interconnecting academic/research institutions within Sri Lanka

• Established in 1990

• Currently interconnects– 15 universities (22 campuses)– National Science Foundation– University Grants Commission

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SIP at Peradeniya

• Implemented sip.edu• Integrated PBX and SIP based VoIP• Direct Inward Dialing from PSTN

• SER for call routing

• Asterisk for PBX features

• ENUM lookup

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SIP at Peradeniya (2)

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Components used

• Mostly Open Source SW– SER and Asterisk– Cisco 3640 w/ ISDN PRI link to PBX as gateway– Ericsson MD100 PBX with MFC R2 link to PSTN– OpenLDAP for campus directory– FreeRARIUS for authentication– MySQL for SER databases and accounting – Perl Scripts for LDAP Lookup/Call Logging– Cisco, Grandstream, LinkSys and x-lite UAs

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Accounting

• Use MySQL for storing call logging from PBX and Cisco gateway

• Two simple daemons written in Perl – Capture text call logging information from PBX– Capture Radius accounting packets from

gateway– Both PBX and VoIP calls go to the same user

account

• Users can check their usage on line

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SIP in LEARN

• Call routing between LEARN sites• SER for call routing

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ENUM

• ENUM servers for country code 94– 4.9.e164.arpa.

• Applied for delegation• Access code 99 for ENUM trials• Used within LEARN• Service providers will be joining trial soon