Voip and routers

I have aqustion
asking about IP telphony
dose cisco recomended to by a router  with built in voip tecknolgy and not recomended to by a voip card
whate is different between the two choices
which is better or less cost

I'm not sure exactly what you mean by a router with voip technology since may routers have voip features depending on the feature set.  The only way to get around having a voip/voice card in the router is if you're going to use a VoIP provider such as a SIP provider for outbound calls.

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