Cisco ATA188-I2-A Administration Guide - Page 210

H.323 Signaling Scenarios Appendix D H.323 Signaling H.323 Signaling Scenarios This section describes call flows for the following scenarios: • H.323 Endpoint-to-Gatekeeper Registration, page D-2 • H.323 Endpoint-to-Endpoint Call Setup with a Common Gatekeeper, page D-5 • H.323 Call Setup from H.323 Network to Circuit Switched Network, page D-14 Each of the call flows includes a call diagram, action descriptions table, and a sample log file. H.323 Endpoint-to-Gatekeeper Registration Figure D-1 illustrates the Cisco ATA registering with an H.323 gatekeeper. This scenario features registration with no authentication. Figure D-1 Cisco ATA-to-H.323 Gatekeeper Registration Endpoint Gatekeeper GRQ GCF/GRJ RRQ RCF/RRJ 72855 Table D-1 Action Descriptions Step Action Description 1. Gatekeeper Request (GRQ)-Cisco ATA to Cisco ATA sends a GRQ message to the H.323 gatekeeper to see if H.323 gatekeeper any gatekeepers are available for registration. 2. Gatekeeper Confirmation (GCF) or gatekeeper Rejection (GRJ)-H.323 gatekeeper to Cisco ATA H.323 gatekeeper returns a GCF or GRJ message, indicating whether or not the responding gatekeeper is able to register new Cisco ATA devices. 3. Registration Request (RRQ)-Cisco ATA Cisco ATA sends a RRQ message to the H.323 gatekeeper in an to H.323 gatekeeper attempt to register as part of that gatekeeper's zone. 4. Registration Confirmation (RCF) or Registration Rejection (RRJ)-H.323 gatekeeper to Cisco ATA H.323 gatekeeper returns a RCF or RRJ message, indicating whether or not the gatekeeper will add the Cisco ATA to its zone. Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0) D-2 OL-4804-01