Guerrilla VoIP

From Hackerspace ACKspace
Revision as of 22:07, 3 July 2013 by Xopr (talk | contribs) (fixed list)
Jump to: navigation, search
Project: Guerrilla VoIP
Featured:
State Active
Members xopr
GitHub No GitHub project defined. Add your project here.
Description low cost communication node
Picture
No project picture! Fill in form Picture or Upload a jpeg here

synopsis

Create a low cost communication node (with VoIP as a base), trying to connect as many as possible types of links, for example:

  • copper/fibre/WiFi network
  • DECT/POTS telephony
  • SIP/SCCP
  • HAM radio (or preferrably, CB radio: 27MC/PMR)
  • copper/WiFi/USB uplink


It also could need some of the following functionality:

  • PoE service (to drive phones, remote switches/accesspoints)
  • battery supported/powered (in case of power failures/lack of power)
  • Efficient power converter(s) when running on battery
  • sturdy compact waterproof casing


So to make the first prototype, I chose the following:

  • ammo box
  • 7Ah battery
  • step-down converter 12->5V
  • step-up converter 12v->48V
  • Fritz!Box 7270 (NAT, FxS, FxO, DECT)
  • Raspberry Pi running FreeSWITCH and DHCP
  • Raspberry Pi running FreeSWITCH and TFTP
  • Netgear GS110TP (8xPoE + 2xSFP)

prototyping

Cisco CP7940 running on a drill battery pack, shows 0.36A at approximately 12V

Tested the following items:

  • Two Raspberry Pis on a drill battery pack (step-down)
    • uses 0.33A at approximately 12V
  • Cisco CP7940 on a drill battery pack
    • uses something between 0.36A and 0.45A at approximately 12V
  • Fritz!box has a switching regulator to 5V tested between 5.5V and 15V (drops off at 5.3V idle and elca at power supply segment is rated 16V)
    • without WiFi, it peaks at 0.44A (12V), and idles at about 0.34A-0.38, which the webservice is saying 41%-43%, which means it would top at about 0.88A.
    • With 15V power it idles at about 0.25A


Still to test/measure/fix:

  • battery, initially 7Ah (ordered)
  • PoE switch at 48v (ordered)
  • whole set with battery and battery charger
  • PoE hack adapter for pre-standard phones (crosslink with 25k resistor across pins 1 and 3)