"I'd be interested to talk with your more about what you're looking to do with sendDigits/DTMF tones on incoming calls, this might be something we should consider adding in the future."
So, I outlined my entire system to her. I have no problem with someone using my idea- however, she was answering a private support issue that I (a paying customer) had, and I was helping her by providing her with more information about what I was doing with her system.
Then, she posted it on her blog without crediting me. Implementing the idea isn't bad; posting a private support thread as your own idea on your own blog, however, is.
I built this to scratch my own itch and its also a really simple use case to illustrate the ability to control real world devices with DTMF tones. Some Twilio projects I had in mind when I built this include Buzzeromatic.com, which is also powered by Twilio and costs $1.95/month and had a very public launch. Sunlight Labs also did a door hack with Twilio and an arduino that I thought was pretty sweet.
What I think is important is that what I've built doesn't have any UI or anything like that, just a really stripped down version and I'm not looking to make it into some paid service. You could certainly take these guts and turn them into a kickass product, but these <100 lines of PHP are not the defensible secret sauce.
The ability to use DTMF tones with Twilio has been around for awhile, I got the tone generator from a Get Satisfction thread that's about a year old: http://getsatisfaction.com/twilio/topics/dtmf_tone_generatio...
Keep up the great work with Twilio- I use it on as many of my projects (such as http://getdoorman.com, my commercial door buzzer app and http://pleasecallmyphone.com) as I can.
Basically anyone who has programmed with VoIP and has a callbox has thought about or done this. E.g., I did this years ago using a VoIP server that I wrote -- silly prompt sounds and all.
Furthermore, companies like Twilio are seldom surprised by applications of their platform; they likely had to come up with tons of examples for investors when they raised money.