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
----- Original Message ----- From: Christian Geng <christian.geng@DETEWE.DE>
Dear Sir or Madame,
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?
No. It should start off with ARQ.
How can the endpoint (callee) on the other side of the gatekeeper be addressed?
Terminal should send an ARQ to the GK with the alias or PBX terminal number. GK will either give the terminal an H.225 Call Signaling Transport Address of the GW or itself(GK) in ACF. Terminal shall simply send a Setup on that address.
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?
No. You will fill the destination endpoint address(alias or PBX number) and send it to GK.
And were can we put in the address of the PBX endpoint (callee)? Thanks
If you are talking about Gatekeeper Routed Calling, please refer to section 8, esp 8.2 of H.323. I am attaching a small sequence diagram for further clarifications. regards, Ravi/Sunil --------------------------------------------------------------------- Ravi Kiran Valmikam VoIP Gateway Group Hughes Software Systems Plot 6, Sector 18, Gurgaon, 122015-HR INDIA Ph (off) +91-124-346666 Ext: 2989, 2990 (res): +91-11-5511011 Fax(off): +91-124-342415
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Ravi Kiran Valmikam