Replaced three new C2300A modems before learning from CenturyLink that the two gray RJ14 phone jacks on the back of the modem are for VOIP service only. Due to the total lack of any documentation for this Actiontec product (as requested by CenturyLink) there is no mention that the two phone out jacks on the back of this modem do not provide a carrier signal for the POTS service, so my fax is not working. t "sees" the modem. CenturyLink Technology's advice is that only the black phone line will provide POTS service on "their" modems. If it's gray or any other color, it serves a different purpose. who knew
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