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MECAGO defines a number of descriptors available for use with commands and responses These descriptors form the parameters of the command and/or response and provide additional information to qualify a given command or response Depending on the command or response in question, a given descriptor will be mandatory, forbidden, or optional In most cases, when a descriptor is not mandatory, it is optional Relatively few cases occur when a descriptor is forbidden The general format of a descriptor is
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Descriptorname=<someID>{parm=value, parm=value, }
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The parameters of a descriptor may be fully specified, underspecified, or overspecified Fully specified means that the parameter is assigned a unique and unambiguous value, which the command recipient must use in processing the command Underspecified involves the use of the choose wildcard ($), allowing the command recipient to select any value it can support Overspecified means that the sender of the command provides a list of acceptable parameter values in order of preference The command recipient selects one of the offered choices for use The response to the command will indicate which of the choices was selected Modem Descriptor This descriptor specifies the modem type and associated parameters to be used in modem connections for audio, video, or data communications or for text conversion The following types of modems are included: V18 (text telephony), V22 (1,200 bps), V22bis (2,400 bps), V32 (9,600 bps), V32bis (14,400 bps), V34 (33,600 bps), V90 (56 Kbps), V91 (64 Kbps), and synchronous ISDN By default, a termination does not have a modem descriptor In other words, at start up no modem-related properties will be specified for a termination They will be applied later as a result of a command (Add or Modify) from an MGC to an MG The modem descriptor was included in the first version of the MEGACO specification (RFC 3015) The descriptor should not be used in subsequent versions of the protocol and should be ignored if received Later in this chapter we describe the syntax of the MEGACO protocol The modem descriptor is listed as a parameter in various commands and responses, but it is included in the MEGACO version 2 syntax only for backwardscompatibility reasons
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Media Gateway Control and the Softswitch Architecture
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Multiplex Descriptor In multimedia communications, different media streams can be carried on different bearer channels The multiplex descriptor specifies the association between media streams and bearers The following multiplex types are supported: H221 H223, H226, V76, and Nx64K Media Descriptor The media descriptor describes the various media streams This is a hierarchical descriptor in that it contains an overall descriptor, known as the termination state descriptor, which is applicable to the termination in general and it contains a number of stream descriptors applicable to each media stream Furthermore, each stream descriptor also contains up to three subordinate descriptors, known respectively as the local control descriptor, the local descriptor, and the remote descriptor This type of hierarchy may be represented by the following list: Media descriptor Termination state descriptor Stream descriptor Local control descriptor Local descriptor Remote descriptor
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Termination State Descriptor This descriptor contains the two properties ServiceStates and EventBufferControl, plus other properties of a termination that are not specific to any media stream The ServiceStates property indicates whether the termination is available for use Three values are applicable: test, out of service, and in service In service does not mean that the termination is currently involved in a call Rather it means that the termination is either actively involved in a call or available for use in a call In service is the default state of a termination The EventBufferControl property specifies whether events detected by the termination are to be buffered following detection or processed immediately To begin, a termination will report events that the MGC has asked it to report, which the MGC will do through the issuance of a command that contains an EventsDescriptor Whether the termination will actually report the events indicated in the EventsDescriptor depends on whether the EventBufferControl is set to off or lockstep If set to off, then the termination will report detected events immediately If the value is set to lockstep, then events will be buffered in a first-in, first-out (FIFO) buffer, along with
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