Conference VOIP

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LCA2019 has its very own phone system this year!


Sponsors are Over The Wire and FaktorTel providing phone calls. FaktorTel, an Over The Wire company, have previously provided VoIP to LCA, and are proud to do so again. They are providing a discount coupon to all LCA2019 delegates that waives setup fees for any month-to-month SIP or Virtual PBX plans purchased through their website. Simply enter the coupon code 'LINUXCONF2019' at checkout to have the setup fee waived.


All LCA Extensions are 5 digits, spread randomly throughout the range of 10000 to 99999. You should have received a random LCA Extension as part of your LCA Welcome pack, inside a sealed envelope.


Over The Wire is an Australian Tier 1 carrier, and is required by Australian law to record metadata of calls made to and from their network. In addition, all calls are EXPLICITLY recorded by the VoIP servers. Any use of the LCA VoIP service to harass, annoy, or upset anyone - either on net or off - will result in immediate termination of access, and possible expulsion from the Conference.

Emergency Calls

IF YOU ARE ON CAMPUS CALL 92111 FROM A CAMPUS PHONE (This number is also available via the VoIP service, but isn't as accurate as using a Campus phone). If you are unable to reach a Campus phone, you can contact them on 0800 823 637. UC Campus has their own medical team, and can liaise with the emergency services to direct them to the correct location on campus.

DO NOT USE THE VoIP SERVICE TO MAKE 111 EMERGENCY CALLS. While a best effort attempt will be made to connect you to local Emergency Services, you are able to call the NZ Emergency Number (111) or International Emergency Number (112) from any mobile phone, with or without a SIM that is registered to a NZ provider.


There is a live-streamed game of Pokemon Crystal that is playable via the Conference VoIP network, at extension 99999. Instructions on how to play are on the VoIP Pokemon page.


Please feel free to list your number in the Conference Phone Directory. There is also a directory here for those who have opted into sharing their details.

You're free to keep your extension details to yourself.

SIP Clients


  • Built-in SIP client: Screenshots with Instructions - Note that some manufacturers disable this (I'm looking at you, Samsung). This integrates with native dialer. See the screenshots for setup instructions. Note that it's quite feature-poor, and buggy. But, it works, and it's built into most phones.
  • Bria: Has a free 14 day trial (handy for a conference that only lasts a week!) and has push notifications, so you don't kill your battery with wakelocks. Is commercial, and is not open source. But, it seems to work well. Install it via the App/Play store.
  • CSipSimple is open source and feature-rich, but has compatibility issues with newer Android versions.
  • Linphone is an open source feature-rich SIP client.


On iOS you will have to install an app. Reddit has a few suggestions for apps.

The following seem to be most commonly suggested as they use a push service and don't drain the battery. Both are paid apps.

  • Bria. 14 day free trial, with monthly or annual subscription (A$1.49/month, A$14.99/y)
  • Groundwire. A$14.99 once off fee.
  • Linphone. Open-source, free


  • Linphone: is an open source feature-rich SIP client.

Configuration Details

You will receive an envelope inside your delegate pack with your login details and a link to the voip help page (this page).

  • SIP server (or domain):
  • Login: see your envelope
  • Password: see your envelope

Calling the outside world

You can call NZ numbers, and a limited selection of international destinations.

Possible ways to dial the outside world:

  • 0011 <country code> <number>
  • 00 <country code> <number>
  • +<country code> <number>

For example, these are all valid ways to call the number 0386521453 in Australia:

  • 001161386521453
  • 0061386521453
  • +61386521453

Countries you can call

  • New Zealand
  • Australia
  • United States of America
  • Canada
  • United Kingdom
  • India
  • France
  • Italy
  • Malaysia
  • Singapore
  • Japan