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Key

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Specifies the crypto suite that the

Spacevars
0company
uses to negotiate with a peer device.

Available options:

  • AES_CM_128_HMAC_SHA1_80. A crypto suite algorithm which uses the 128 bit AES-CM encryption key and a 80 bit HMAC_SHA1 message authentication tag length.
  • AES_CM_128_HMAC_SHA1_32. A crypto suite algorithm which uses the 128 bit AES-CM encryption key and a 32 bit HMAC_SHA1 message authentication tag length.

Default option: AES_CM_128_HMAC_SHA1_80.

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Master Key - Field Definitions

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Master Key Lifetime

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Specifies whether or not the Primary Master Key has an expiry.

Lifetime Value

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Specifies the lifetime of the Primary Master Key, measured in numbers of SRTP packets expressed as a power of 2 (i.e., 2^n SRTP Packets) with a configurable range of 2^1 to 2^48 . When Primary Master Key Lifetime is configured to Never Expires, a Lifetime Value of 2^48 is used.

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Specifies the length of the Primary Master Key Identifier, in bytes, sent in the SRTP packet.

The key identifier (MKI) identifies the primary master key from which the session key(s) were derived that authenticate and/or encrypt the particular packet.

If the MKI indicator is set to one(key identifier length > 0), the length (in octets) of the MKI field, and (for the sender) the actual value of the currently active MKI (the value of the MKI indicator and length MUST be kept fixed for the lifetime of the context).

Set this value to 0 to disable the MKI in SDP.

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