For business trunk lines I would certainly reccommend Cbeyond (http://cbeyond.net) They provide T1s to customer sites in their footprint and have been providing business class phone/data services on a completely IP based network since 2001.
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For business trunk lines I would certainly reccommend Cbeyond (http://cbeyond.net)
They provide T1s to customer sites in their footprint and have been providing business class phone/data services on a completely IP based network since 2001.