[akira2501]

> The only justification is the ease of communication over the phone.

I mean.. as opposed to two numbers? A slow speed high error correction audio encoding of them would be easy. Call emergency services, press the button, they decode the tones, immediate, accurate, simple.

If you mixed the calling and playback into a single action, you could make calls and direct people without even the ability to speak.

[cbo100]

Well yeah, I'm not convinced either, but I also don't deal with panic ridden callers to emergency phone lines. I think I've called emergency 3 times in my many years.

Maybe it helps with an issue they have noticed with certain callers that I'm not aware of.