The FC-0613 is NOT A SIP VOIP PHONE (Voice over Internet Provider) and will not work correctly if connected to a SIP VOIP NETWORK. However this phone works great when connected to a Cable Tv / Internet modem. The New Picture Care Desktop Phone FC-0613 brought to you by Future Call is the newest picture phone model that makes sense. This phone has all the features that our previous picture care model FC-1007 has, including the ability to place pictures on buttons for ease of memory, 10 two-touch or 10 one-touch memory keys for number programming, bright LED lights for incoming calls and a red 911 key to easily access the authorities in an emergency situation. This device includes a volume Hi/Low/OFF switch which has been relocated to the back of the phone to prevent accidental changes from happening. The FC-0613 Model has a NEW FEATURE, a On/Off switch that prevents accidental reprogramming from occurring. If the ON-OFF switch is set to the OFF position, you will not be able to store any phone numbers to your desired memory button, making any attempt to overwrite an existing programmed memory button impossible. To utilize this setting, set the ON-OFF button to the ON position to program the numbers you would like to store on the phone. Once the numbers have been programmed, simply switch back to the OFF position, which will keep your numbers permanently stored, even during a power outage. Finally, a feature that makes it safer and easier to use and prevents changes or mistakes from being made once the numbers have been stored. Another feature added to this new model, which you will find helpful, is that all the buttons have been moved to the back of the phone to prevent accidental changes and the red 911 button is re-programmable if needed. This phone is only for desktop use and is not made to hang on walls. This picture care phone along with other picture care phones do not include an answering machine or message feature.