[Freeswitch-users] Dialplan: how to check whether a User is registered?

Is there a way to check if a user is registered locally? I have the following Scanrio: If a call comes in from an external gateway then Freeswitch1 shall check if the destination UA is registered locally. If not then redirect (302) the call to Freeswitch2. But how to determine that the UA who shall receive the call is registered here? Is there another way instead of - trying o bridge - and if it fails take the next condition? Best regards Peter