Disclosure: I am a Developer Evangelist at Twilio.
I just published a blog post on how to use Webhooks and Concerns to integrate Twilio into a Rails 4 application. I hope some of you might find this useful:
I’ve also published the full source for this tutorial on Github:
This is the first in a series of blog posts about building Twilio apps using Rails 4. If you have any questions or think any topics would be useful to cover, please do let me know.
Developer Evangelist, Twilio