From Seasteading
< User:Heath
Revision as of 15:33, 31 May 2008 by Heath (talk | contribs) (Instructions)
Jump to: navigation, search

This is probably the only area that I can call myself an expert in.

Asterisk can be made to build a tricked out phone system of any size at a trivial cost.

Ultimately, this page will be a set of config files, patches and dependencies for building such a system.

Current version doesn't do GSM. Mainly because I have no idea how to do it.


  • MELP/MELPe - Military grade compression for minimizing bandwidth consumption
  • AMR - What cellphones use
  • g723.1/g729 - What voip phones use
  • iLBC/speex - Open source low-bitrate codecs

Useful protocols

  • Bluetooth will be implemented via chan_bluetooth or chan_cellphone
  • GSM will be implemented with a commercial gateway.
  • Regular POTS service can be done using hardware
  • SIP - VoIP protocol
  • IAX2 - Lightweight VoIP protocol


  • At least a P4 2.4 2GB server with a focus on reliability (solid disk, passive cooling if possible) $1000
  • Backup server/load balancer $1000
  • Half decent switch $300
  • Digium AEX2460E Analog Card 6x4 FXS + Echo can $1800
  • g729 licenses $100
  • 20U Rack $500
  • Rackmount UPS $500
  • Far end server colocation $400/month


  • Existing network/Internet
  • Cool/dry/secure area
  • ~1000 watts available power


  • Used to switch calls
  • Used to translate between various protocols
  • Used to perform IVR functionality such as voicemail


  • IAX2 has an aes128 option
  • Bluetooth (cough) security
  • Not all that great in the open source world, but reasonable security can be achieved.


  • Build servers. Insert Digium card/s.
  • Load the ups/servers/patch panels into the rack.
  • Connect power; connect servers to switch
  • Load Debian or Ubuntu Server onto the servers.
  • Follow these instructions - Easy if you've done it a few times.
  • Follow these instructions - Have a friend nearby to take your aggression out on.
  • Install my MELPe hacks.
  • Install your favorite billing software
  • Connect the system to the LAN/WAN
  • Order a dedicated server, nothing special.
  • Install Debian, then Asterisk, like we did before
  • Have colo personnel install MELPe hardware, then install MELPe hacks
  • Follow these instructions to connect to the colo server
  • Subscribe to server per minute voip providers and configure them on the dedicated server
  • Connect to them via _X.,1,Dial(sip/myprovider/${EXTEN})

Using a colo is avoidable if enough bandwidth is available. Will TSI one day be the termination point for HF?