Using the pinout from nethopper’s post, I made my own cable using the headset/charging breakout cable provided with my original Sprint Mogul (HTC 6800) pictured here:

So that you may not have to create an account there, here’s the pinout:

After cracking open the breakout cable with a knife, you have access to the pcb with everything on it.  Internally, the headset pins 1 - 6 are actually labeled 6 - 11 on the pcb.  So the pinout for this breakout should be:

You’ll have to desolder the headset connector, and cut the wires from the pcb, but it’s not THAT much work..

Here’s the end result, which surprisingly worked the first time, and I’m terrible with a soldering iron:

Of course, if you don’t care about being able to charge the Touch Pro, you can just use a headset connector and RCA cable.. Just remember that Pins 3 and 5 need to be grounded to tell the Touch that the cable is a video cable and not a headset.

Google Voice has the option of forwarding all incoming calls to multiple numbers.  Additionally, it can forward calls to a Gizmo number.  Gizmo, is a standard SIP-based VoIP service.  Meaning that an Analog Telephone Adapter can be used to attach any standard PTSN telephone you want to your Gizmo account.

So what does that really mean?

After registering for a Gizmo account, I set up my ATA, similar to this $30 ATA from Grandstream, to use the Gizmo service.

Then I configured Google Voice to forward calls to my Gizmo number, which requires an exciting verification process that consists of answering the phone and dialing 2 numbers.

Voila!  Free incoming calls to a real phone at my house, which has no standard pots landline.  Additionally, if I get bored of talking to you on my landline, I just press *, answer on my cell phone and hit the road.