|As FishMonger pointed out, your question is a little vague so I'm going to have to do some guessing and assuming here. It's up to you to provide the details so we have a better understanding of what's going on, and what you're trying to achieve.|
First, is this a home network, or is it in the work place?
If I'm reading this right you have an existing network that provides internet. Likely this connects to a SOHO router and your devices connect to the router either via wired connections or wirelessly. If this is correct, please say so and provide the make/model of the router you have connected to the internet.
You decided you want to use VoIP and the VoIP provider has probably provided you with their own router to use. If this is correct, please say so and provide the make/model of the router they gave you.
If I'm right, you would have to connect the new VoIP router to the existing one. If I'm right, I'll give you a how-to guide to help you do so.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.