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Old 04-16-2012, 02:45 AM
aa1 aa1 is offline
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Default QOS | IPSI, H323, Encryption question

Please take a look at this document to see if it will help you:

Avaya AuraŽ Communication Manager Security Design
Release 6.2

The IPSI link is secured using the AES-128-CBC [AES] encryption algorithm to prevent unauthorized access or modification. Inside the encrypted payload, the CRC-16 algorithm is used for error detection and to prevent unauthorized modification of the payload. Since the IPSI link is between only a specific interface card and the Communication Manager server, the key that is used to secure that link needs to be known only by those two entities. AES-128-CBC is dependent on the previous ciphertext block and the current plaintext. Hence, it is unlikely that a cycle of any length is visible unless the transmitted information is identical.

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