Dear Sir or Madame, We want to develop a H.323 based VoIp telefon system attached to our PBX. There will be a gatekeeper to manage the callhandling in our zone. A H.323 gateway shall translate between PBX and H.323 world. There is a specific question we didn't found answered in the ITU recommendations. We want to setup a call from a H.323 terminal to an endpoint placed in the PBX. This call should be via gatekeeper. Shoul first a setup been done to the gatekeeper? How can the endpoint (callee) on the other side of the gatekeeper be addressed? When we do first the setup to the gatekeeper, we will put in the H.225.0 Setup-UUI/destinationAddress the AliasAddress of the gatekeeper. Is this right? And were can we put in the address of the PBX endpoint (callee)? Thanks Cincerely Christian Geng