Is it possible to insert custom data in phone call initialization?

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I want to send some custom flag when user initiate call with other user(s). On the other side I would install app that will catch call when it is in status ringing and I want to read that flag. Basically I want to use some space within package, that is titled as free data form (that is only info I got so far).

This is going to be Android and/or iPhone app. Anything that will work.

Is it even possible?

asked 15 secs ago

TheLittleHawk

552

Is it possible to insert custom data in phone call initialization?