Can I connect my PC to my DSL line via one modem and simultaneously connect my VOIP phone in a different location with a different modem to the same DSL line?

Answer 1

No you can not. To further explain more information is needed. When you say "different Location" are you talking about another room in a house? or a different place all together? If it is just in a different room then you want to use a router to connect multiple devices to one modem.

If it is the latter, the reason you cannot have 2 different modems is because you Service provider of you DSL internet will not allow you to have 2 modems active at the same time. When you activated your DSL with your service provider the "Provisioned" your modem to their network. In other words they allowed that one specific modem access to the internet.

The Serial number and the MAC address on the modem are what your service provider put into their system to allow that specific modem onto their network. In order for you two have 2 different modems active at the same time they will charge you 2 access fee's, basically just double what your current internet bill is.

Hope that helped :)