How do i restrict extensions to a trunk

OK the title says it all. How can i map an extension to a trunk for outgoing calls. I dont wanna lock the trunk douwn with passwords or dial a prifix first. Basically i want all outgoing on extension 1 to go through trunk 1. I read a few things on here but… no luck. Any ideas please?

Have you read How to give a particular extension different or restricted trunk access for outgoing calls and Basic usage of route prefixes to reroute calls from specific extensions???

Thanks buddy. Loads of reading material there. Will check it out. thanks