Features a.. VPN Support ( Additional Cost) b.. Customized Skin Interfaces c.. Call Timer * Display Balance d.. Last Number Redial

e.. Local Signalization (Dial tone, busy, ring back, etc.) for user comfort f.. Mute g.. Touch-Tones h.. Address Book i.. Microphone Volume Control j.. Speaker Volume Control Benefits a.. Use Microsoft g723.1 codec b.. Small Application

c.. Works with any Full-Duplex sound card d.. USB headset support. e.. Works well on most of the versions of Microsoft Windows ( NT4, 2000, XP, 2003) f.. UPNP NAT / Firewall support, stable SIP, RTP ports

g.. Specify NAT IP to be written in SIP messages h.. Auto-Configuration of settings for easy deployment i.. STUN support for NAT detection and classification j.. Configuration Wizard k.. Uses New RFC 3261 compliant stack