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I'm curious why you feel the request/response model doesn't scale to more complex apps. SIP itself is request/response based, and telecom in general also is.

Their API may be lacking certain features, (I'm not sure you can do fine grained control of individual call legs) but is there a reason you don't like the request/response model?

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I didn't mean that I don't like the request/response model. I meant going beyond that, by which I meant voicemail, hold music, extensions, conference calls, and so on, seems like it would be difficult to implement with the Twilio model. That's all.

If you don't need those, this looks killer. Otherwise, might as well just bite the bullet and set up Asterisk.

All of those things are very easy to implement with Twilio (which I thought even before I started working there).

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