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Figure 4-19 Fast connect procedure
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Setup (faststart [logical channel infol]) Call Proceeding ARQ ACF Alerting Connect (faststart [logical channel infol]) Media Exchange Release Complete DRQ DRQ DCF
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all the logical channels associated with the call and is equivalent to using the procedures of H245 to close the logical channels
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In addition to the Fast-Connect procedure, H323 also enables H245 messages to be encapsulated with Q931 messages as octet strings An endpoint that wants to encapsulate such messages with Q931 messages sets the element h245Tunneling to true in the first Q931 message that it sends and keeps the element set to true in every other message that it sends as long as it wants to support such encapsulation For a calling endpoint, this means that the h245Tunneling element should be set to true in the Setup message Note that a called endpoint can use encapsulation only if the calling endpoint indicates support for encapsulation in the Setup message The encapsulated data is actually contained within the h245Control element, which, like all H323 information, is included in the User-to-User information element of the Q931 message Note that a conflict exists between encapsulation and faststart After all, the faststart element itself is a type of encapsulated H245 message ConDownloaded 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
sequently, a calling endpoint should not include a faststart element and an encapsulated H245 message in a Q931 Setup message If, however, the endpoint wants to support encapsulation with later commands, then it should still set the h245Tunneling element to true such that the called endpoint knows that the calling endpoint can support encapsulation As is the case for the fast-connect procedure, the use of encapsulation means that there is no separate H245 control channel, since H245 messages are carried on the call-signaling channel What happens if an endpoint needs to send an H245 message at a time when it does not have a particular need to send a call-signaling message This situation can be handled in one of two ways First, an endpoint can send a Facility message with an encapsulated H245 message Alternatively, either endpoint can choose to change to a separate H245 control channel An endpoint indicates a desire to switch to a separate H245 control channel by populating the h245address element in a Q931 message In such a case, any existing logical channels established by Fast-Connect or through encapsulation shall be inherited by the H245 control channel as if they had been established through normal H245 procedures If the endpoint wants to change to a separate H245 control channel and has no need to send a Q931 message, then it has no means of indicating an H245 address to the other endpoint Again, the Facility message comes to the rescue, because that message can be sent at any time All that is necessary is to send a Facility message with a FacilityReason of startH245 and with the h245address element populated with the endpoint s own H245 address This effectively establishes a separate H245 control channel Any subsequent Q931 messages must have the h245Tunneling element set to false as anything else would be inconsistent with a separate H245 control channel
Conference Calls
The previous descriptions and examples have focused on the signaling necessary for the establishment and release of two-party calls Situations will occur, however, when several parties are involved in a multipoint conference In fact, H323 defines the MC for the purpose of managing multipoint conferences A conference call may be established in two ways One is a prearranged conference, where participants call in to a separate MCU, which controls the conference The other is when a two-party call needs to be expanded to include other parties This is known as an ad hoc conference
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
H323
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