Media Gateway Control and the Softswitch Architecture in .NET

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Media Gateway Control and the Softswitch Architecture
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In this example, the message is issued by an MGC at address 111111222222 and port 34567 One transaction is identified by TransactionID 12345 and two commands are related to context 1111 Both commands are Add commands, causing terminations A5555 and A6666 to be added to context 1111 The transaction includes one command related to any context that the MG may choose This command is an Add command, whereby termination A7777 is added to the context The processing of this command would result in the MG creating a new context, for which the ContextID would be returned in the response Transactions within a message are treated independently The order of the transactions within the message does not imply an order in which the recipient of the message should handle the transactions Note that this is quite different from the handling of commands within a transaction, where the ordering of the commands is of significance
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Overview of MEGACO Commands
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MEGACO defines eight commands that provide the ability to control and manipulate contexts and terminations Most of the commands are sent from an MGC to an MG The exceptions are the exception of the Notify command, which is always sent from MG to MGC and the ServiceChange command, which may be sent from either an MG or an MGC The eight commands are as follows:
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Add The Add command adds a termination to a context If the command does not specify a particular context to which to add the termination, then a new context is created If the command does not indicate a specific TerminationID but instead uses the choose ($) wildcard, the MG will create a new ephemeral termination and add it to the context Modify The Modify command changes the property values of a termination, instructs a termination to issue one or more signals, or instructs a termination to detect and report specific events Subtract The Subtract command removes a termination from a context The response to the command can provide statistics related to the termination s participation in the context These reported statistics depend upon the type of termination in question For an RTP termination, the statistics can include items such as packets sent,
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Media Gateway Control and the Softswitch Architecture
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Media Gateway Control and the Softswitch Architecture
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packets received, jitter, and so on In this respect, the command is similar to the MGCP DLCX command If the result of a Subtract command is the removal of the last termination from a context, then the context itself is deleted
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Move The Move command moves a termination from one context to another The command is not used to move a termination from or to the null context as these operations must be performed with the Add and Subtract commands respectively The capability to move a termination from one context to another provides a useful tool for accomplishing the call-waiting service AuditValue The AuditValue command is used by the MGC to retrieve current values for properties, events, and signals associated with one or more terminations AuditCapabilities The AuditCapabilities command is used by an MGC to retrieve the possible values of properties, signals, and events associated with one or more terminations At first glance, this command may appear very similar to the AuditValue command The difference between them is that the AuditValue command is used to determine the current status of a termination, whereas the AuditCapabilities command is used to determine the possible statuses that a termination might assume For example, AuditValue would indicate any signals that are currently being applied by a termination, where AuditCapabilities could indicate all the possible signals that the termination could apply if required Notify The Notify command is issued by an MG to inform the MGC of events that have occurred within the MG The events to be reported will typically have previously been requested as part of a command from the MGC to the MG, such as a Modify command The events reported will be accompanied by a RequestID parameter to enable the MGC to correlate reported events with previous requests ServiceChange The ServiceChange command enables an MG to inform an MGC that a group of terminations is about to be taken out of service or is being returned to service The command is also used in a situation where an MGC is handing over control of an MG to another MGC In that case, the command is first issued from the controlling MGC to the MG to instigate the transfer of control Subsequently, the MG issues the ServiceChange command to the new MGC as a means of establishing the new relationship
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