Presto has been developed and tested to work with most Analog phone lines. It hasn't been until very recently that we have heard demand for VOIP support among our customers. We have heard anecdotally that some customers have been successful using it with their Printing Mailboxes, however, there are several configurations, VOIP adapters and providers, making it difficult to say exactly which combination will work. Comments about this topic on Presto Place and the aggressive marketing by both telephone and cable companies to sell VOIP services to a broader array of customers has gotten our attention. We are in the process of learning more about the different VOIP offerings and whether there are identifiable solutions that work with Presto. We'll be sure to keep you updated as we learn more.
Director of Product Management
Presto Services, Inc.
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Quick follow up: There's no mention of Presto here: http://www.comcast.com/Customers/FAQ/FaqDetails.ashx?Id=3197
But perhaps one of the modem's listed is the same/similar to the one used inside the Presto?