Cut-Leash-Voip-Howto
Will has a VoIP wiring guide for folks who went Vonage, etc…. “In today’s How-To, we’re taking the diagonal cutters to the Ma Bell umbilical cord and hooking up our voice over IP adapter so we can use our old phone jacks. No soldering irons or caustic acid required. This time.”Link.

Related:
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VoIP Phone Wiring – Connecting multiple phones to a Vonage connection – MAKE 06Page 112.