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Moscow erlang users meeetup 2013 01-12 erlrtpproxy

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Peter Lemenkov
Peter Lemenkov
TechnologyNews & Politics
1 of 12
Peter Lemenkov Presented by Erlang & Telephony
Erlang & Telephony
Agenda 1. AverycommonVoIPissue 2. ...andatraditionalapproach. 3. HowtosolveitbetterwithErlang?
A common VoIP issue • IPv4+UDP+NAT+Lotsofports(RTP,RTCP,audio,video) • IPv6isn'tgoingtofixthatfully. • Transcoding • Lawfulinterception • Dumb(proprietary)hardwareclients • Statsretrieval • Prepaidsolutions
A traditional approach • SetupsomeMiTMcomponent • SIPBack-2-BackUA+RTPproxy=SessionBorderController • JustasingleRTPproxy • Within-kernelprocessing(usingnetfilter,whichisfastbutfeature-poor) • Withprocessinginuserspace(somewhatslow,butfeature-rich) • RelyonSTUN/TURN/ICEwhichWON'Tworkreliably(compareGoogleTalkwithSkypebeingbehindtheNAT)
Enter RTPproxy • Simple(somewhatoutdated)controlprotocol. • UserspaceRTPprocessing. • WritteninplainportableC(fastintermsofCPUusageperclient). • Reliableandproven.
Erlrtpproxy • UserspaceRTP/RTCPprocessing • WritteninErlang(easilyextensible) • Morethanjustadumbproxy • Transcoding • Music-on-HoldandRTPinjection • HTTPserverforstatsandfinetuning • SRTP/ZRTPusingErlangcryptolibrary(w.i.p.) • RADIUSnotifications • Eventsloggingviasyslog
What about performance? • Somewhatslow(~10-15%slower)intermsofCPUperClient(itdoesmoreanditstillnotwell optimized). • Awaytoobetterintermsofscalability • Nocommandreplypenaltyduetonumberofclients. • Noadditionallatencyafterafewhundredofclients(“fewhundred”isapracticallimitforRTPproxy). • Fasterreplies(~10timesfasterthanRTPproxy)
Conclusion (a techie PoV) • JustrewriteinErlangandyou'llgetlinearscalabilityforfree. • Ifyoudo“justrewriteinErlang”you'llprobablyloosesomeCPUcycles.AskMaxLapshinaboutpossible optimizations(nexttalk). • Muchsmallerandcleanercodebase(especiallywithregardstoprotocolparsing) • Linearandpredictableresourcerequirements CPU,memory,NICthroughput.–
Conclusion (an ISV view) • Nomatterwhatyourcustomerwants youcanimplementitblazinglyfast.– • Opensourcingwasagoodidea I'vegotalotsofbugreports,usecases,andrandomideas.– • Reliableandrock-solid Irebootedittwiceaftertheinstallation.– • [petro@mediapro~]$uptime • 15:53:18up328days,16:53, 1user, loadaverage:0.47,0.49,0.54
Links • http://www.erlang.org/ • http://rtpproxy.org/ • http://mediaproxy.ag-projects.com/ • http://www.2p.cz/en/netfilter_rtp_proxy • https://github.com/lemenkov/erlrtpproxy
Questions? lemenkov@gmail.com Contact:

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Moscow erlang users meeetup 2013 01-12 erlrtpproxy

  • 4. A common VoIP issue • IPv4+UDP+NAT+Lotsofports(RTP,RTCP,audio,video) • IPv6isn'tgoingtofixthatfully. • Transcoding • Lawfulinterception • Dumb(proprietary)hardwareclients • Statsretrieval • Prepaidsolutions
  • 5. A traditional approach • SetupsomeMiTMcomponent • SIPBack-2-BackUA+RTPproxy=SessionBorderController • JustasingleRTPproxy • Within-kernelprocessing(usingnetfilter,whichisfastbutfeature-poor) • Withprocessinginuserspace(somewhatslow,butfeature-rich) • RelyonSTUN/TURN/ICEwhichWON'Tworkreliably(compareGoogleTalkwithSkypebeingbehindtheNAT)
  • 6. Enter RTPproxy • Simple(somewhatoutdated)controlprotocol. • UserspaceRTPprocessing. • WritteninplainportableC(fastintermsofCPUusageperclient). • Reliableandproven.
  • 7. Erlrtpproxy • UserspaceRTP/RTCPprocessing • WritteninErlang(easilyextensible) • Morethanjustadumbproxy • Transcoding • Music-on-HoldandRTPinjection • HTTPserverforstatsandfinetuning • SRTP/ZRTPusingErlangcryptolibrary(w.i.p.) • RADIUSnotifications • Eventsloggingviasyslog
  • 8. What about performance? • Somewhatslow(~10-15%slower)intermsofCPUperClient(itdoesmoreanditstillnotwell optimized). • Awaytoobetterintermsofscalability • Nocommandreplypenaltyduetonumberofclients. • Noadditionallatencyafterafewhundredofclients(“fewhundred”isapracticallimitforRTPproxy). • Fasterreplies(~10timesfasterthanRTPproxy)
  • 9. Conclusion (a techie PoV) • JustrewriteinErlangandyou'llgetlinearscalabilityforfree. • Ifyoudo“justrewriteinErlang”you'llprobablyloosesomeCPUcycles.AskMaxLapshinaboutpossible optimizations(nexttalk). • Muchsmallerandcleanercodebase(especiallywithregardstoprotocolparsing) • Linearandpredictableresourcerequirements CPU,memory,NICthroughput.–
  • 10. Conclusion (an ISV view) • Nomatterwhatyourcustomerwants youcanimplementitblazinglyfast.– • Opensourcingwasagoodidea I'vegotalotsofbugreports,usecases,andrandomideas.– • Reliableandrock-solid Irebootedittwiceaftertheinstallation.– • [petro@mediapro~]$uptime • 15:53:18up328days,16:53, 1user, loadaverage:0.47,0.49,0.54
  • 11. Links • http://www.erlang.org/ • http://rtpproxy.org/ • http://mediaproxy.ag-projects.com/ • http://www.2p.cz/en/netfilter_rtp_proxy • https://github.com/lemenkov/erlrtpproxy