[Freeswitch-users] Campon busy for external calls

[Michael Jerris]

https://freeswitch.org/confluence/display/FREESWITCH/Channel+Variables#ChannelVariables-Camp-onrelatedvariables

On Thursday, July 28, 2016, Rick Jarvis <rick.jarvis at magicmail.mooo.com>
wrote:

> Has anyone come up with a way of providing ‘camp-on busy’ for outgoing
> external calls? It’s often referred to as ‘Ring Back’ in the UK, (not to be
> confused with the artificial ring tone), so that a user can press a button
> on receiving the busy signal, and the call will ring the originator when
> the called line becomes available, and then connected to the called number
> when they pick up.
>
> We’re looking into it following a customer request, and it’s looking like
> it’s not well supported across providers, so wondering about doing
> something programatically. Eg attempt the call every minute in the
> background, until either the line becomes free, or a timeout (an hour or
> so) occurs.
>
> It will take me a while to figure out how to do this, so don’t want to
> reinvent the wheel if this has been achieved already!?
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