Outbound Route user_exist condition

[babak]

Hi
when defining new outbound route Fusionpbx automatically creates some dialplans.
first one is : condition ${user_exist}= false
what is purpose of this line ?

Thanks

 

[babak]

from IRC <Tekmason> :
This sends the call out to a gateway if (user) does not exist on this FusionPBX system