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H323 Directory Gatekeeper - CCM - H225 Setup

Hi Guys/Gals,

I am trying to understand the call setup of a H323 directory gatekeeper environment using Cisco Call Manager.

I am looking at the network like this:

CM Cluster 1 -> GK1 --> DIR GK --> GK2 -> CM Cluster 2

My impression is that the CM Cluster 1 sends ARQ to GK1, This would then send LRQ to the DIR GK (this is when the GK can not resolve the address locally), GK1 then sends back RIP - Request in Progress) DIR GK sends LRQ to GK2 which sends LCF to GK1 which sends ACF to CM Cluster 1.

At this stage CM Cluster 1 creates a TCP connection (port 1720) to CM Cluster 2 at which point the CM will send ARQ to GK2 to ask for permission to receive the call.

GK2 would then reply with say ACF before CM Cluster 2 responds to CM Cluster 1 with a H225 setup acknowlegement.

--- Me Boss says the setup ack would be send out (from cluster 2 to cluster 1) without the ARQ and ACF process to and from CM Cluster 2 from GK2.

I Don't this this is correct and say it is included, does anyone out there know the answer to this?

Thanks in advance!


Re: H323 Directory Gatekeeper - CCM - H225 Setup

Your understanding is correct. CM Cluster 2 will ARQ and require an ACF for permission to answer CM Cluster 1's call.

This is essential for Anonymous Device support to work correctly in CCM.


Let me know if this helps by rating the post.


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