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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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The transaction relates to only one context: the null context identified by the symbol - (line C) Only one command is specified, a Modify command, and it applies to all terminations in this context as indicated by the all (*) wildcard (line D) The command has two descriptors The first is an events descriptor with a RequestID value of 7777 (line E) Only one event is to be detected: the offhook (of) event, which belongs to the Analog Line Supervision package (al) (line E) Note that line E, by having both a right and left bracket, totally describes this descriptor Note also the comma, which indicates that another descriptor is to be expected The next descriptor is the DigitMap descriptor, which specifies a DigitMap name of Map1 (line F) The details of the digit map are given on line G This line also contains a right bracket, which terminates the DigitMap descriptor The fact that no subsequent comma is used indicates that no more descriptors are included for this command Line H just contains a right bracket, terminating the Modify command Line I just contains a right bracket, terminating the set of commands applied to this context Line J contains a right bracket terminating the transaction Within the syntax, we know that this is a transaction request, as opposed to a transaction reply or a transaction pending This is due to the use of the string Transaction on line B A transaction reply would utilize the string Reply and a transaction pending would utilize the string Pending
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Response Syntax The previous example command leads to a fairly simple
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response as follows:
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A2 B2 C2 D2 MEGACO/1 [111111333333]:5678 Reply = 12345 { Context = - { Modify = *} }
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The same basic structure is applied to the response In this case, the message is issued from the MG, and consequently the IP address and port numbers are different (line A2) The TransactionID is the same as in the transaction request; however the Reply token is used to indicate that this is a reply (line B2) Line C2 specifies the context, the null context, as in the transaction request Line C2 also lists the commands the response is issued to (Modify) and the terminations the commands apply to (all of them in this case) No descriptors are used in the response Line D2 uses a right bracket to indicate the end of the reply
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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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Media Gateway Control and the Softswitch Architecture
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Responses in the Case of Failure The previous example showed a reply
where the command was carried out successfully Cases will occur, however, when one or more commands cannot be carried out Situations might also arise when a complete transaction might fail To accommodate such situations, MEGACO uses the error descriptor described earlier to indicate failure of a command and the reason for the failure Let s assume that the MG was completely unable to execute the foregoing command due to an internal error In that case, the MG would respond as follows:
MEGACO/1 [111111333333]:5678 Reply = 12345 { Context = - { Modify = * { Error = 500 { Internal Gateway Error} } } }
By examining this response, we can see that the error being reported is applicable to the Modify command Equally, the error descriptor might be applied higher up, say, at the level of a transaction if a complete transaction could not be executed This could arise, for example, in the case of some internal error in the MG, a syntax error in the transaction request, or for any number of reasons Add, Modify, and Move Commands The Add, Modify, and Move commands are practically identical in terms of the syntax used The only syntactical difference between them is in the names of the commands themselves All three commands include the descriptors media, modem, mux, events, EventBuffer, signals, DigitMap, and audit all of which are optional Version 2 of the specification does not actually use the modem descriptor, but it is retained in the command syntax for backwards compatibility with MEGACO version 1 To indicate that items are optional in the ABNF syntax, we enclose them in square brackets ([,]) Therefore, the syntax of the commands can be represented as follows, where the command is Add, Move, or Modify
Command ( TerminationID [, MediaDescriptor] [, ModemDescriptor] [, MuxDescriptor] [, EventsDescriptor] [, EventBufferDescriptor] [, SignalsDescriptor]
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