You should have told them you had a fax machine. Fax machine and modem communication are virtually identical.

Originally Posted By: Ooma
Ooma does support fax machines, but can only do so on a best effort basis. We recommend that you connect the fax machine to the back of your Ooma Hub device and dial the prefix *99 before you place an outgoing fax call. If you have a high-performance Internet connection, you should have no problems with short faxes (less than 5 pages). For additional information about using Ooma with a fax machine, check out this support article.

There's also some code, IIRC, to throttle down the TiVo's connection speed, which makes it more stable over VoIP connections.
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Bitt Faulk