What is the goal here? What criteria determines what sip trunk you want to use? Is it only to display certain outbound caller ID's based on which extension you make the outbound call from? If so, you can configure an outbound route for each trunk as described but instead of installing the allowed routes module, you can use the caller-id field in the dialing rules to match the extension you want to use that route. Just another way to do it and really shows the flexibility of FreePBX.
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