[Freeswitch-users] Can you detect if a gateway exists from the dialplan?

I want to have different gateways defined on dev and prod servers, but with the same dialplan code used between them. Is there an API function I can put in a condition to detect if a gateway exists? (I had a look through google and the wiki, and the closest looking thing was domain_exists.) Or am I meant to just try bridging to it, and dealing with a failure? Cheers, Fraser