[Freeswitch-users] Multiple trunks failover schema setting up !

[CpServiceSPb]

Hi.
I have 3 external SIP trunks for making external calls, provided by SIP
telephony carriers:
SIP carrier1,
SIP carrier2,
SIP carrier3.

If SIP carrier1 trunk is ready to making callings then the outboud calling
outside of FS is making using the trunk, otherwise, for example, if the
trunk state is unknown/invalid or disabled by carrier that is unavailable
or already ringing/busy then attempting of calling will be made using SIP
carrier2 and if the same situation with SIP carrier2 trunk then attempting
of calling will be made using SIP carrier3 trunk and if SIP carrier3 trunk
has state which do not allow the calling voice message to caller will be
send back
What is the best way to make the following schema ?
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