I used to do that with Twilio directly too, and just got tired of configuring the same thing multiple times with multiple accounts. I added a simple voicemail inbox and then made a UI to display all the messages and voicemail recordings, and that became oneway.tel.

So oneway.tel is basically just the Twilio messages/calls/recordings log in a more convenient interface, with Google/FB auth (which is convenient for me).

If you're already experienced with Twilio configuration and their console then $5/month may not be worth it.