3.2.5.2.1 Input Data Used in the Crypto Binding HMAC-SHA1-160 Operation

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The data that is used as the input to the HMAC-SHA1-160 operation and also 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). In this case, the Compound MAC field and Padding field MUST be zeroed out.