![]() ![]() Times, messages belonging to the same call that pass the firewall If resources are allocated for a call multiple When resources are allocated for a call, all counters for calls andĪctive calls increment. The callĬreation and tearing down is done by Facility messages afterward. Using Avaya H.323 counters-The counters for callsĪnd active calls are not applicable to the Avaya H.323 ALG. H.245 ports are not used in an Avaya call flow process. H.245 messages are used in the call control channel, and are encoded TSAP is dynamically assigned from the previous call signaling process. Two endpoints, is performed through the call control channel whose The call control, including opening/closing media channels between ![]() The call setup and tear down is performed through theĬall signaling channel whose TSAP is the well-known TCP port (1720). Within a zone or across two zones, or even across multiple zones (multipointĬonference). Or a dynamically assigned port from the discovery or registrationĬall Control and Call Setup-Calls can be established The Transport ServiceĪccess Point (TSAP) can utilize either the well-known UDP port (1719) In both registration and admission phases, the Registration,Īdmission, and Status (RAS) channel is used. Making a call, an endpoint asks its gatekeeper for permission to place Note that Junos OSĮndpoint Registration, Admission, and Status-AnĮndpoint registers to a gatekeeper and asks for its management. To a known IP and the well-known UDP port 1719. Through the gatekeeper discovery process, via broadcast or unicast Gatekeeper Discovery-An endpoint finds its gatekeeper Protocols Q.931 (with port number 1720) and H.245. The dynamic links for data, video, and audio streams, following the That are used for call signaling and call control for VoIP. H.323 consists of a suite of protocols (such as H.225.0 and H.245) Protocol defined by the International Telecommunication Union (ITU-T). The H.323 standard is a legacy voice-over-IP (VoIP) ![]()
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