25 Dec 2001, PIPE version 1.0 
+ first phone release

03 May 2002, PIPE versions 1.1, 1.2 
+ several minor bugs have been fixed.

09 September 2002, PIPE version 1.3
+ added following hotkeys/shortcuts:
  Alt-Shift-P  show PIPE window (global hotkey)
  Alt-H        hide PIPE window
  Alt-X        exit PIPE
+ alert sounds are moved to *.wav files, so they can be replaced by user.

21 September 2002, PIPE version 1.4
+ added ADPCM voice codec
+ implemented new codec selection strategy for different type of calls:
  - GSM codec for Internet calls, providing good voice fidelity and compression ratio
  - ADPCM codec for LAN calls, ennsuring higher sound fidelity but less degree of compression 
+ created new "Settings" menu item to allow enable/disable voice activation of outgoing network traffic

