I need to send out a different trunk for fax only. I have an ATA registered as extension 600. How do I force it to go out a specific trunk?
If you are using a relatively recent version, you can use the “Caller ID” column in the outbound route configuration.
If not, the old “Add a prefix and strip it out on the way out” method still works.
How does the outbound trunk get setup to know what trunk to use with that particular DID?
Trunks don’t use trunks. The outbound route has a trunk selector that you use to pick the outbound trunk. The Caller ID of the FAX machine is what is the key in the outbound route.
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