Take a look at these (there are many more):
They can somehow route text messages sent to land-line phones to a web interface, probably similar to Google's Messages Web interface where you can view, receive, and send SMS messages from your computer as if they came from your cellphone.
https://support.google.com/messages/ans ... 1075?hl=en
A similar but less desirable feature would be if you could engineer it to route texts that are sent to our land line, to a cell number.
The goal is simply to have one Sonic phone number work for voice, voice mail, and fax (which it already does), plus texting. Could you do that?