Guerrilla VoIP

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Revision as of 19:50, 23 January 2015 by Xopr (talk | contribs) (reorganised some stuff, started to look messy, added VLAN info on the side)
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Project: Guerrilla VoIP
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Members xopr
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Description low cost communication node
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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

prototyping

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)
  • two Raspberry Pis running FreeSWITCH (external queue, internal SCCP server), DHCP and TFTP
  • Netgear GS110TP (8xPoE + 2xSFP)

Some power tests

hardware power source U I
Two Raspberry Pis, step down drill battery pack 12V 330mA
Cisco CP7940, step up drill battery pack 12V 360mA - 450mA
Fritz!box (wifi off), direct lab power supply 12V 360mA (idle) - 440mA
(42% - 52%, top ~880mA)
15V 250mA (idle)
Netgear GS110TP PoE, step up lab power supply 12V 330mA
Netgear GS110TP PoE +
Cisco CP7940, step up
lab power supply 12V 740mA
Complete set: 2 RasPis,
Fritz!box, switch,
phone + cellphone charging
lab power supply 12V 2000mA
13.8V 1600mA

interesting facts

  • Fritz!box has a switching regulator to 5V tested between 5.5V and 15V (drops off at 5.3V idle and elco at power supply segment is rated 16V)
  • PoE hack adapter connected pin 1 (white-orange) and pin 3 (white-green) with 22K resistor.
  • if the pre-standard CP-79x0 is connected using the PoE adapter hack, the Netgear GS110TP doesn't power, when you unplug it, it will enable power within 5 seconds; plug in, and the phone boots.
  • if you configure the administrative VLAN, the phone will fetch a DHCP lease on that VLAN, allowing you to seperately set up dnsmasq on a Raspberry Pi

done

  • the first version works, but still needs some manual labor
  • Telephone system:Cisco PoE hack cable
  • Cisco NL dialplan
  • tested with battery; float charging device still has to be made (haven't measured how long it would run on a single charge though, but enough time to do some important phone calling)

todo

  • work out 'modus operandi': multiple config files switchable by phone
  • work on dual linux config with GPIO hardware switch
  • test the fibre ports
  • add homeplug as a proof of concept
  • design and create (or buy) small-sized float charger (13.8V 2A) with overcurrent protection, if needed