I've used the AudioVox HP300-S for a little while. It's a SIP/H.323 phone with power (power supply was included with mine) and Ethernet ports on the back. On the front is an LCD display, the dial-pad, and various buttons such as hold, transfer, etc. I think it's about $140 or so. I've only used the SIP firmware. It supports Static IP, DHCP, and PPPoE for IP addressing. It supports G711 ulaw, G711 alaw, G723.1, and G729 codecs, but only ONE can be selected. It can be configured either via a web interface or via the buttons and keypad on the phone. It supports at least SIP and H.323 (it may support other protocols), but if you want to use a different protocol (switch from SIP to H.323, for example) you have to sent it back and AudioVox will do the cross-grade. If you want to just update the firmware you can do that via TFTP. This device does NOT appear to support any kind of dial-plan configuration and does not seem to support any kind of digit timeout. You have to press # at the end of any calls you dial. This alone would keep me from recommending this phone to anyone. The cradle for the handset is too shallow and the handset falls off the phone if you bump it or move it. The phone displays the phone number of the phone on the LCD display, HOWEVER, if your number is less than 11 digits the display will show what appears to be whatever digits there were previously to pad the displayed number to 11 digits. Cosmetic, but not very professional. Each option on the web interface requires you to click on the SET button next to the option, there is no way to make several changes to a page on the web interface and then submit all the changes on the page at once. It does not support any VLAN tagging. As far as I can tell the phone ONLY supports INBAND DTMF. I've not been able to get any number I call to recognize the DTMF, not external IVR systems nor the internal Asterisk application VoiceMailMain. This device does support setting the input gain and output gain and allows you to set the receive buffer (small, medium, and large). There is no headset port on this phone. The back panel has cutouts for an Ethernet port to plug a PC into and an FXO port for analog pass-thru. I assume other models of this phone have these options and they just use the same case. Overall I think this phone sucks. Technical support doesn't seem to be great, but at least a real person responds to e-mails. The tech person I spoke to said there will be a new version of the firmware available soon. Here is the version information for the unit I have. Hardware Version: HP232 REV 0.1 Software Version: HD.00.A6 Bootrom Version: B.00.07 Release Date: 2002/DEV/12