I think calling folks back from a number different than what they dialed to reach me.. might defeat the purpose. Thanks for sharing your setup.
That is the one downside of this is now having two numbers to deal with. I was getting so many garbage calls though, the trade off has been worth it.
This introduces two ways of working with the service - either you set the service to show "your" phone number as the calling party, and then listen to the name when picking up, or you ignore this and use the softphone app for all calls.