According to customer service representatives at TimeWarner Cable servicing Los Angeles, customers who were migrated from Comcast and had Comcast phone service are being told to switch telephone carriers.
Due to an FCC requirement, the customers must be given a choice (i.e. Cable guys are under equal access rules). So while Time Warner also offers Digital Phone service, the switch from Comcast is more than a brand name change. This means TWC customers affected have to make the switch to another carrier, including TWC or the usual VoIP suspects like Vonage, Earthlink, Broadvoice, Lingo, VoicePulse etc. My guess is most will opt for Time Warner's offering of a triple or even Four Play with their new mobile service, Pivot (based by Sprint) that will eventually offer dual mode capabilities.