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2.2.4.3 Callback Acknowledgment Message

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The Callback Acknowledgment message is sent by an answerer to a caller. This contains the configuration option selected by the caller and completes the acknowledgment of the Callback Configuration option.

The message format is specified as follows


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Code

Identifier

Length

Data (variable)

...

Code (1 byte): This MUST be 0x03.

Identifier (1 byte): This MUST specify a value that assists in matching the Callback Request message to the corresponding Callback Response message and Callback Acknowledgment message. This MUST be set to the Identifier of the Callback Response message that is being acknowledged.

Length (2 bytes): This MUST specify the length of the message, including the Code, Identifier, Length, and Data fields.

Data (variable): This contains the configuration option selected by the caller (section 2.2.3).

The Callback Configuration Option specified MUST be the Callback Configuration Option received from the caller in the Callback Response message and MUST be specified as defined in section 2.2.4.2.