I'm wondering why you want your hacked DTivo to dial in at all. If it's hacked, which it must be if you have ethernet capability, then you run the risk of losing your hacks from an unwanted software update. The only valid reason for having a phone connected would be to offload PPV data for billing purposes. You can circumvent this by ordering your PPVs via the DTV website so your account gets billed directly.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!