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D-5
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
OL-4008-01
Appendix D H.323 Signaling
H.323 Signaling Scenarios
H.323 Endpoint-to-Endpoint Call Setup with a Common Gatekeeper
Figure D-2 illustrates a Cisco ATA initiating a connection to another Cisco ATA that is registered with
the same H.323 gatekeeper. This scenario features registration with no authentication.
Note This scenario assumes that the H.323 configuration employs Slow Start Signaling with tunneling
capability.
Figure D-2 H.323 Endpoint-to-Endpoint Call Setup with a Common Gatekeeper
ARQ
Endpoint 1
Gatekeeper 1
Endpoint 2
ACF/ARJ
Set-Up
72856
Call Proceeding
ARQ
ACF/ARJ
Alerting
Connect
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