Check the wiki: http://wiki.freeswitch.org/wiki/Mod_commands#originate

Find the below:

You can specify the UUID of an originated call by doing the following:

• Use create_uuid to generate a UUID to use.
• This will allow you to kill an originated call before it is answered by using uuid_kill.
• If you specify origination_uuid it will remain the UUID for answered call leg for the whole session.

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