Cisco ATA188-I2-A Administration Guide - Page 224
H.245 Open Audio Logical Channel-Local, Q.931 Connect-Gateway to local H.323
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H.323 Signaling Scenarios Appendix D H.323 Signaling Table D-5 Action Descriptions (continued) Step Action Description 6. Gateway Admission Request (ARQ)-SCN/PSTN Gateway to H.323 gatekeeper (Somewhat simultaneous, chronologically, to call setup and call proceeding) Gateway contacts the common H.323 gatekeeper, seeking authorization to complete the two-way H.323 network-to-CSN/PSTN Gateway call. 7. Gateway Admission Confirm (ACF) or H.323 gatekeeper returns a ACF or ARJ message, indicating Admission Reject (ARJ)-H.323 gatekeeper to whether or not the responding gatekeeper is going to allow the CSN/PSTN Gateway Gateway access to the network. 8. Q.931 Alerting-Gateway endpoint to local Status message is sent to calling H.323 endpoint advising that the H.323 endpoint called party has been notified (phone ringing). 9. Q.931 Connect-Gateway to local H.323 endpoint Status message is sent to calling H.323 endpoint advising that the called party has answered the call (phone off hook). 10. Open TCP Channel for H.245 Dynamically assigned TCP port is opened on both the local H.323 endpoint and the Gateway, allowing for subsequent call setup activities (transmission and reception capability exchange, master-slave relationship determination, and so on). 11. H.245 Terminal Capabilities 12. H.245 Terminal Capabilities 13. H.245 Terminal Capabilities 14. H.245 Terminal Capabilities Various endpoint transmission and reception capabilities defining operation of voice, video, and data are exchanged and acknowledged to ensure consistent, reliable two-way communication between the H.323 endpoint and the Gateway. 15. Exchange of Master-Slave Determination Determines master and slave assignments between the H.323 Messages-Remote H.323 endpoint to local endpoint and the Gateway. H.323 endpoint 16. H.245 Open Audio Logical Channel-Local Before actual transmission or reception of voice, video, or data, H.323 endpoint to remote H.323 endpoint notification that the primary logical channel for the local H.323 endpoint has been opened, ensuring clear two-way communication. 17. H.245 Open Audio Logical Channel Gateway acknowledges readiness. Acknowledgement-Remote H.323 endpoint to local H.323 endpoint 18. H.245 Open Audio Logical Channel-Remote Before actual transmission or reception of voice, video, or data, H.323 endpoint to local H.323 endpoint notification that the primary logical channel for the Gateway has been opened, ensuring clear two-way communication. 19. H.245 Open Audio Logical Channel Local H.323 endpoint acknowledges readiness. Acknowledgement-Local H.323 endpoint to remote H.323 endpoint 20. Bi-Directional Audio with Transcoding Between Two-way communication ensues between the local H.323 Endpoint and Gateway endpoint and the CSN/PSTN Gateway. D-16 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0) OL-4804-01