[asterisk-dev] AMD

Richard Mudgett rmudgett at digium.com
Thu Jan 30 17:34:23 CST 2020

On Thu, Jan 30, 2020 at 5:19 PM Kevin Harwell <kharwell at digium.com> wrote:

> On Thu, Jan 30, 2020 at 2:58 PM info at magnussolution.com <
> info at magnussolution.com> wrote:
>> in my country when I dial to a mobile and I not answer the call, the call
>> going to the voicemail, but the audio is executed before the 200OK, on 183
>> early media.
>> so, I need to execute the AMD when I receive the 183, not the 200 OK.
> Unfortunately I am unaware of any easy solution.
> Something to be aware of if you are not. From what I understand app_dial
> is reading the frames from the channel. Any solution that attempts to also
> read frames from the same channel at the same time is going to run into
> problems. So for instance, you can't execute app_dial and app_amd at the
> same time.
> If you wish to inject some kind of audio listening, and detection
> algorithms while dialing you'll have to do that within the confines of the
> dial application. Basically, while app_dial is waiting for the other side
> to answer it's processing frames. When an audio frame is received then that
> is where you'll want to do your detection. Also once answered you'll need
> to continue processing incoming audio frames. Maybe you are already doing
> all of this?
> If that's the case then if a hangup occurs app_dial will automatically
> handle what you need since it will detect the hangup and stop reading
> frames, which in turn means audio will not get passed down into your
> detection checks anymore. There is no loop to break out of since the dial
> application is handing that for you (reading of frames, etc.).

Frame hooks or audio hooks might help here.  Off hand, I don't know if they
are active at this time but they might make it easier to implement in
another module.

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