You can see an example of using continue_on_fail here:
http://wiki.sangoma.com/NSC-SIP-Trunking-Load-Balancing-And-Failover

In your case, you play back a message instead of the second bridge.

On Mon, Oct 10, 2016 at 5:15 AM, Richard Gleason
<rgleason@voipnetwork.net> wrote:
> Hello Guys,
>
> Need some help with a dial plan that I'm working on.
>
> The goal is to play a pre-recorded message to the originator on congestion.
>
> For example, if GW replies back to FreeSWITCH with code SIP 404, I want to
> trigger a pre-recorded message and play it back to the originator.
>
> Dial plan uses option bridge.
>
> If it is not difuclt can some one provide an example of dial plan for this
> action.
>
> Thanks.
>
> --
> Best Regards,
> Richard Gleason
>

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