BTW, you don't need to worry about complying unless you are a Tier 1 ISP - if any part of your Internet connections travel over ATT/Level3/Cogent/XO etc, then the NSA is already plugged into their fiber.
You are completely incorrect.
ALL FACILITIES BASED INTERNET PROVIDERS must comply. That means, if you have equipment that connects people or homes or businesses or places... YOU MUST COMPLY.
The VOIP providers did NOT ignore E911. I was about to get into the VOIP business. The VOIP business is all but dead, even with huge customer growth, because E911 mandates built in enough overhead on voice traffic to ensure that copper based voice wasn't in danger.
CALEA compliance for VOIP providers will be incredibly more complex and expensive, too.