Heads up: Fax won't work over plain VOIP because of the audio compression; it's unlikely they have a gateway available on their network that will do T.38 FOIP, they'd need a real POTS line to send a fax (or use one of the many internet fax services).
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Heads up: Fax won't work over plain VOIP because of the audio compression; it's unlikely they have a gateway available on their network that will do T.38 FOIP, they'd need a real POTS line to send a fax (or use one of the many internet fax services).