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Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
Learning Erlang And Developing A Sip Server Stack With 30k Potential Users
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Learning Erlang And Developing A Sip Server Stack With 30k Potential Users

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  • 1. Learning Erlang and developing a SIP  server/stack with 30k potential users Fredrik Thulin <sip:ft@it.su.se> Enheten för IT och media Stockholms universitet EUC2004
  • 2. Stockholm university telephony in  1997 : Ericsson MD110 ● 5000 subscribers ● 2000 : Ericsson MD110 – 4200 subscribers ● Cisco CallManager – 800 subscribers ● Early VoIP adopters, but still no open standard ●
  • 3. SIP Session Initiation Protocol ● IETF proposed standard (RFC3261, 2, 3, 4 and 5) ● Does not care about audio/video/whatever ● Instant messaging and presence ● Parsing is hard, even though (?) it's plain text ● Transactions are complex ● Few open source implementations as to date ●
  • 4. Personal Erlang experience No prior knowledge about functional  ● programming Hard time understanding some syntax (strings are  ● lists, [H | T] = “string”) Assign once ● Really like cheap processes and the IPC ●
  • 5. Implementation Magnus Ahltorp, KTH made a couple of  ● implementations in Perl, Python, C, ... Erlang implementation was the most viable one ● First Yxa snapshot released 2003­10­07 ● OTP supervisor model ● 15000 lines of code, 5000 lines of comments ●
  • 6. OTP supervisor model sipserver_sup sipsocket directory transaction_layer logger sipsocket_udp tcp_dispatcher tcp_listener
  • 7. Plans Build distributed SIP servers ● for routing – for students (free VoIP/SIP­service, no PSTN) – for basic call service? Evaluating. – Distributed policy control (perimeter defense ­  ● rate limiting etc.) External event logging with call context ● RFC compliant stack, easy to write applications ●
  • 8. Perimeter defense Internet Servers running Yxa incomingproxy Rate limiting number of ongoing calls per host, class  – C network, domain, SSL certificate etc.
  • 9. Project http://www.stacken.kth.se/projekt/yxa/ ●

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