* Compatible with Windows 98/Me/2000/XP/2003
* Supports work behind NAT/Firewall (STUN is used)
* G.723.1, G.729, G.711 codecs
* Voice Activity Detection (reduces data traffic sent during silence periods)
* Automatic adjustable Jitter buffer
* DTMF tones (can be integrated with voice mail or other tone driven system)
* Registers with gatekeeper or works through gateway
* Displays balance (the summ that remains on user's account)
* Redial of last number
* History of 10 latest dialed numbers
* Quick dial users list
* Private Branding

It supports user interface skins. With a skin, a company can private brand the soft phone with a new logo and even a completely different look to the soft phone.

Demo version is available here:
http://www.duxoft.com