The Megaco spec H.248.1 defines :

        transactions    SEQUENCE OF Transaction

 

where

Transaction ::= CHOICE

{

    transactionRequest      TransactionRequest,

    transactionPending  TransactionPending,

    transactionReply    TransactionReply,

    transactionResponseAck  TransactionResponseAck,

          -- use of response acks is dependent on underlying transport

    ...

}

 

and it uses AUTOMATIC TAGS.

 

My question is over the encoding: for each transaction is there a tag for the CHOICE (followed by the tag for the transaction),

or just a tag for the type of transaction.

If the former presumably the tag is context 0?

 

Ie is it:

A1 xx

a0 xx a1 ….. //a request

a0 xx ax …//some other

.

.

 

 

or

A1 xx

            a1 …

            ax ..

            .

            .

???

Thanks

Robert Hewitt

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