Figure 1 shows a simple diagram of how you can set up your in home network so that you can be surfing the web while talking on your ViaTalk phone.
Basically what you want to do here is have your adapter in-between your phone or your phone jack (only if you have your home isolated for ViaTalk phone service*) and your router or high-speed modem (only if it has two Ethernet ports).
*To isolate your home for ViaTalk phone servie check the Install Guide FAQ located at Support