astTECS offers three IP phone models - the ast520, ast550, and wifi-enabled ast600W. The phones have features like HD voice, multiple lines, soft keys, and phonebooks. They are designed for both small businesses and large offices. The phones support SIP-based IP PBX and softswitch platforms and have features such as call holding, conferencing, and caller ID. astTECS is an enterprise communications provider that also offers support through global support centers.