If you have a home VoIP phone service such as Vonage, you are restricted to either having one phone where your phone adapter is (usually by your computer) or you can use wireless phones where only the main base needs to be plugged into the phone adapter. If you have satellite receivers, fax or an alarm system you usually want to make all your phone outlets work in your house. To do this is easy but it's at your own risk.
First you want
to make sure your DSL service is what's called a Stand Alone service (also called a Dry Loop). This basically means that there is no dial tone traveling through the phone lines only a DSL signal which you usually cannot hear. Then you want to make sure that every phone outlet you are going to use has a DSL filter on it. This is very important cause if there is not a DSL filter then as soon as you pick up the phone your internet will go down and consequently your VoIP phone service.
Once you have DSL filters installed on each outlet you want to take a phone cord and run it from your VoIP phone adapter's phone port to the port labeled 'Phone' on your DSL modem. That port is shown below on a Qwest M100 DSL modem.
Once you have that connected you should be set. What this is doing is sending your VoIP dial tone through your home wiring together with your DSL signal then the DSL filters are filtering out the DSL signal when you pick up the phone so it is clear and not interfering with the DSL. I have tested this in several places and it works but my word of caution is that if you ever get a power surge through your phone lines due to a lighting storm for example, it may damage your VoIP phone adapter.
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