qr code c# example cont RAS messages that support RAS signaling functions in VS .NET

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Table 4-1 cont RAS messages that support RAS signaling functions
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Message BandwidthConfirm (BCF) BandwidthReject (BRJ) Function Positive response to a BandwidthRequest Used by a gatekeeper or endpoint to deny a change in bandwidth BRJ should be used by an endpoint only if the new bandwidth cannot be supported Sent by a gatekeeper to an endpoint in order to request status information Sent from an endpoint to a gatekeeper to provide status information Can be sent on demand or autonomously Sent by a gatekeeper as confirmation of the receipt of an IRR Sent by a gatekeeper upon receiving an IRR in an error situation, such as from an unregistered endpoint Sent by an endpoint or gatekeeper to request disconnection of a call at an endpoint Positive response to a DRQ Negative response to a DRQ, such as one from an unregistered endpoint Sent to a gatekeeper to request translation from an alias to a network address Response to an LRQ, including the required address Response to an LRQ when translation was not successful Vendor-specific Sent in response to a message that is not recognized Sent by an endpoint or gatekeeper as an interim response when a request is taking a long time to process Sent by a gateway to a gatekeeper to inform the gatekeeper of the gateway s current capacity Sent by a gatekeeper as acknowledgment to an RAI Sent by a gatekeeper or endpoint in order to initiate a separate service control session related to advanced features and services This message was introduced in H323 version 4 Sent to acknowledge the receipt of an SCI message, but does not necessarily mean that the service client will initiate the session as given in SCI
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InfoRequest (IRQ) InfoRequestResponse (IRR) InfoRequestAck (IACK) InfoRequestNak (INAK) DisengageRequest (DRQ) DisengageConfirm (DCF) DisengageReject (DRJ) LocationRequest (LRQ) LocationConfirm (LCF) LocationReject (LRJ) Non-Standard Message (NSM) UnknownMessage Response (XRS) RequestInProgress (RIP) ResourceAvailableIndicate (RAI) ResourceAvailableConfirm (RAC) ServiceControlIndication (SCI)
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ServiceControlResponse (SCR)
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H323
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In a network that has one or more gatekeepers, an endpoint should register with one of the gatekeepers In order to perform this registration, the endpoint must first find a suitably accommodating gatekeeper one that is willing to take control of the endpoint Of course, the endpoint may be configured in advance with the address of the gatekeeper that should be used In that case, no discovery process takes place per se Rather, the endpoint simply registers with the gatekeeper in question Although such an approach might lead to a quicker registration, it lacks flexibility In a given network, several gatekeepers may be in a load-sharing mode or a backup gatekeeper might need to assume the role of a failed gatekeeper A static endpoint-gatekeeper relationship is not best suited for such scenarios Therefore, an automatic gatekeeper discovery process is available The gatekeeper discovery process is available for an endpoint to determine its gatekeeper in the event that it does not already have that information In order to discover which gatekeeper is to exercise control over a given endpoint, the endpoint sends a gateway-request message (GRQ) This message can be sent to a number of known addresses, or it can be sent to the gatekeeper discovery multicast address and port 2240141:1718 The GRQ message contains a number of parameters One of these is a gatekeeper identifier If this parameter is empty, the GRQ indicates to those gatekeepers that receive the message that the endpoint is soliciting gatekeepers and is willing to accept any available gatekeeper In other words, the endpoint is asking, Will someone be my gatekeeper In the case that the parameter contains an identifier, the endpoint is asking a specific gatekeeper to be the endpoint s gatekeeper One or more of the gatekeepers may respond with a gatekeeperconfirmation (GCF) message, indicating that the gatekeeper is willing to control the endpoint Alternatively, a gatekeeper may respond with a gatekeeper-reject (GRJ) message, indicating that the gatekeeper is not willing to assume control of that endpoint In the case that a gatekeeper sends a GRJ message, it will include a reason for the rejection, such as lack of resources at the gatekeeper The process is illustrated in Figure 4-5 In this scenario, the terminal wanting to determine its gatekeeper sends just one GRQ message, but sends it to the gatekeeper discovery multicast address Therefore, more than one gatekeeper can receive the message In Figure 4-5, gatekeeper 1 sends a GRJ message, whereas gatekeeper 2 sends a GCF message The terminal will now proceed to register with gatekeeper 2
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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H323
H323
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