Asterisk's "dsp.c" (even the old version in the app_rpt fork, I believe) does indeed already decode them at no additional cost, so I too would have expected them to just come along for the ride. Does some other part of the system filter them out?

Who cares why -- although I can think of a dozen use cases without even trying hard. Besides, it costs absolutely nothing when you're already doing the other digits. Let the man have his tones, I say.

$0.02,

Eric
K5BFC

On Thu, Aug 14, 2014 at 7:29 AM, Bryan Fields <Bryan@bryanfields.net> wrote:

On 8/14/14, 9:24 AM, Bryan D. Boyle wrote:
> The issue is *why* is it so danged important to have the A-D keys decoded?
> security through obscurity? Because they are there on ham mics?
>
> No one has really described a use case for why this artifact of the whole dtmf
> protocol is really needed. especially when, with the asterisk system, there
> is almost an unlimited functionality with using just the 10 digits bracketed
> by the star and octothorpe.