Currently IP Office certificate support does not include the following:
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You cannot configure mutual authentication for IP Office Linux-based applications, including Avaya one-X® Portal for IP Office and Voicemail Pro. They cannot check any received certificate against the TCS.
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SIP clients certificates are not requested.
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The received certificate tests of IP Office do not include revocation checks such as OCSP or CRLs.
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No support for DSA or EC-DSA public key certificates, or RSA public keys above 4096 bits. Avaya recommends using RSA public keys of 2048 bits.