Cisco Systems ATA 188 Manual De Usuario
D-2
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 Signaling Scenarios
This section describes call flows for the following scenarios:
•
•
•
Each of the call flows includes a call diagram, action descriptions table, and a sample log file.
H.323 Endpoint-to-Gatekeeper Registration
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
Table D-1
Action Descriptions
Step
Action
Description
1.
Gatekeeper Request (GRQ)—Cisco ATA to
H.323 gatekeeper
H.323 gatekeeper
Cisco ATA sends a GRQ message to the H.323 gatekeeper to see if
any gatekeepers are available for registration.
any gatekeepers are available for registration.
2.
Gatekeeper Confirmation (GCF) or
gatekeeper Rejection (GRJ)—H.323
gatekeeper to Cisco ATA
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.
or not the responding gatekeeper is able to register new Cisco ATA
devices.
3.
Registration Request (RRQ)—Cisco ATA to
H.323 gatekeeper
H.323 gatekeeper
Cisco ATA sends a RRQ message to the H.323 gatekeeper in an
attempt to register as part of that gatekeeper’s zone.
attempt to register as part of that gatekeeper’s zone.
4.
Registration Confirmation (RCF) or
Registration Rejection (RRJ)—H.323
gatekeeper to Cisco ATA
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.
or not the gatekeeper will add the Cisco ATA to its zone.
GRQ
GCF/GRJ
72855
RRQ
RCF/RRJ
Endpoint
Gatekeeper