184.108.40.206.3 Input Data Used in the Crypto Binding HMAC-SHA256-256 Operation
The data that is used as the input to the HMAC-SHA256-256 operation and used in the creation of the Compound MAC MUST be constructed from the entire 112 bytes of the Call Connected message (section 2.2.11) with the Compound MAC field and Padding field zeroed out.
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