The rtpdir bridge - to bridge EchoLink, IRLP, D-Star and Asterisk   by Scott, KI4LKF  http://rtpdir.weebly.com/

More information on his D-Star project implementations:  Open Source / Dextra can be found here.

This group was set up to host the RtpDir bridge software(Real Time Protocol Director).
RtpDir is a VoIP software for Amateur(ham) operators.  It can also be used on other bands, Government, commercial and private nets, or direct user to user without any radios connected.
If a band requires an FCC license, it is the responsibility of the end-user to obtain one.  rtpDir runs on Linux or Windows platforms.  NEW FEATURE: *Asterisk*/app_rpt PBX interface. There are 3 versions: Linux GUI, Windows GUI, Linux(text mode). 

This group was set up to host the RTPDir bridge software(Real Time Protocol Director).
It can be used on the Amateur bands, Government, commercial and private nets,
or direct user to user without any radios connected.
If a band requires an FCC license, it is the responsibility of the end-user to obtain one.
3 versions: Linux GUI, Windows GUI, Linux (text mode).
To download, click on "Files".
NEW: Listen to D-Star real-time audio.
NEW: TX/RX to/from D-Star.

Basic features:
================

Bridges and RX/TX from/to D-Star, Asterisk/app_rpt, IRLP, Echolink, Speak-Freely.
Create and operate your own private VoIP net.
Full-featured IRLP and Echolink node(link, repeater, ...).
Multiple Asterisk, Echolink nodes are accepted even when an IRLP node is connected.

Basic features:

• Runs as Echolink/Echolink conference, IRLP reflector/Echolink conference, Echolink+IRLP, private net.
• Accepts *Asterisk*/app_rpt connections
• Can transmit to *Asterisk*,IRLP,Echolink using computer mic or radio
• Graphical environment.
• DTMF control from Windows or Linux
• Control your Asterisk nodes directly using IRLP DTMFs.
• Control your IRLP node directly using Asterisk DTMFs
• Remote text command control using ssh/Linux or PuTTY/Windows.
• Can TX/RX IRLP messages without the IRLP board.
• Any station can connect to rtpDir bridge. It does not have to be IRLP or Echolink
• GSM, ADPCM, LINEAR codecs are supported.
• Protocol conversion between IRLP, Echolink and *Asterisk*/app_rpt
• ADPCM, u-Law, GSM, AMBE(with DVSI chip) codec transcoders included.
• Protocol conversion between D-Star, Asterisk/app_rpt, IRLP, Echolink, Speak-Freely.
• DTMF processing internal(built-in) or External(hardware).
• Morse code IDs or Voice.
• COS "sensing" or VOX or both.
• Support for all link interfaces(sound mode or ASCII mode, VA3TO, WB2REM, G3VFP, G4CDY,...Rigblasters, MFJ, SignalLink,...)
• No need to buy the Asterisk URI board or modify a USB sound fob.
• No need to buy the IRLP board.
• Mark a station as "Mute", "Deaf" or "Mute and Deaf".
• Timeouts for login, download, connection.
• Activity reporting.
• Audio recording and playback.
• RF station identification(audio, CW).
• Welcome message(audio, CW or text).
• Recording, playback and controlled announcements.
• Convert text to CW.
• Runs as server or client.
• Interfaces with external scripts.
• Runs with or without a soundcard.
• Audio signal strength indicator.

GUI Screenshot:

 INTRODUCTION---rtpDir:   An Asterisk/app_rpt-IRLP-Echolink application.
======================================================================
   rtpDir is a VoIP software that can run on any station, repeater or link.
The current version 1.31 runs also as a BRIDGE conference server with a graphical interface.
rtpDir uses RTP/RTCP protocol.


Configuration choices
========================================
   It can be configured to run as Echolink/Echolink conference.
   It can be configured to run as Echolink + IRLP with codec GSM or ADPCM.
   It can be configured to run as an IRLP reflector/Echolink conference
      on a specific reflector channel(port) with codec GSM or ADPCM.
   IRLP Links and repeaters, Echolink links and repeaters are also supported.
   *Asterisk*/app_rpt nodes are also supported.

rtpDir bridge now accepts *Asterisk*/app_rpt node connections.  Three nodes types will be accepted: *Asterisk*, IRLP, Echolink.

  The following codec transcoders and protocol converters are built-in:
  
  IRLP/gsm ---> IRLP/adpcm
  IRLP/adpcm ---> IRLP/gsm
  IRLP/adpcm ---> Echolink/gsm
  IRLP/gsm ---> Echolink/gsm
  Echolink/gsm ---> IRLP/adpcm
  Echolink/gsm ---> IRLP/gsm
  Asterisk ---> IRLP/adpcm
  Asterisk ---> IRLP/gsm
  Asterisk ---> Echolink/gsm
  IRLP/adpcm ---> Asterisk
  IRLP/adpcm ---> Asterisk
  Echolink/gsm ---> Asterisk

  rtpDir bridge can be used to talk to other *Asterisk*/app_rpt nodes using the radio or the computer mic and speakers.