This can be implemenred using freeswitch.
Ping me directly after you install freeswith on linux and configure ssh remote access

§Ó§ä, 19 §ã§Ö§ß§ä. 2017 §Ô., 6:27 ÕÔ¹ú½Ü <zhaoguojie2010@163.com>:

Thanks Daniel,

    I've done some digging, and from Andrew Prokop's blog, it says this envolves early midia. Usually this is done by reply a 183 to the caller with media ip and port in the SDP. This makes sense but i still have no idea how to generate 183 response with embedded SDP.

At 2017-09-18 18:05:46, "Daniel Tryba" <d.tryba@pocos.nl> wrote:
>On Mon, Sep 18, 2017 at 03:37:22PM +0800, ÕÔ¹ú½Ü wrote:
>>      I want the caller to play a short audio(like "the number your are calling is busy") when the callee declines the call. How can i do that?
>
>You need to check for the status codes in a failure route and then
>somehow generate audio somewhere, which is out of the scope of kamailio
>(maybe rtpproxy can do this, otherwise use something like asterisk):
>
>failure_route[MANAGE_FAILURE] {
>if (t_check_status("486"))
>{
>  $du=null;
>  $ru="busymessage@asterisk.example.org";
>  route(RELAY);
>  exit;
>}
>
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