7.1.2.2.2. Remote Gateway 
This is the name given to an HG 3500 configured for trunking in an
OpenScape 4000, which registers with another, external gatekeeper or
registry for address resolution.
Only HG 3500 gateways that are not OpenScape 4000s, e.g. OpenScape
Voice or an Internet Service Provider, may register as remote gateways
with the system.