Dial In Numbers (DIN) are local numbers (DID) which you can subscribe and receive calls with. When a call is received at one of these numbers, we'll make a GET request to a URL you specify that will contain commands on how to process the call (i.e transfer it to another number, play a music file or say something using Text-to-Speech).
We have web APIs that allows you to manipulate the Dial In Numbers such as subscribe, set action URLs to be called when a call comes in and also unsubscribe numbers.
Refer also to our documentation on the format and usable commands that is available to process incoming calls via the action URL.
For pricing information and supported Dial In Numbers, please go to our pricing page.