I think is will help you
http://lists.freeswitch.org/pipermail/freeswitch-users/2015-July/114369.html

On Mon, Aug 17, 2015 at 8:18 PM, Alex Lake <alex@digitalmail.com> wrote:
Got an application where it can sometimes take several seconds for an
outbound call to give any progress.
I'd like the A-party to hear UK ringing "to be getting on with" so they
don't think there's something wrong and hang up prematurely.

How do I do this?

Cheers,
Alex

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