restrictions on H.450.x-connections

Hello H.450-Experts,

H.450.5 points out in chapter 5: "The architecture of SS-PARK and SS-PICKUP allows any authorized user of an H.323 network to participate in this supplementary service and not just users within a single gatekeeper zone.".

Is this statement also valid for all the other H.450-standards?

Thanks a lot in advance for your reply.

Regards, Wolfgang Bandow CT-B / Berlin