Perhaps, but I am sure John Q. Public wouldn't tolerate this from either the iLEC or local cable company. Imagine if you were billed for cable tv from order date, not installation date! Again, in J. Q. Public's mind, the live date for a Voip service is the day you receive your ATA, not the day you order it.
All in all, the simplest thing is to simply disclose this billing policy up front as well as in the terms of service.
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