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EcimDerivedString with length constraint (0..20) and pattern restriction. Allowed values are digest or optimized.
digest - S-CSCF will always verify the stored authentication challenge response against the received one, and if the verification fails, a new challenge will be sent.
optimized - S-CSCF keeps knowledge of the IP address of the registered contact after a successful authentication (at initial registration) and compares received IP address with the stored IP address to authenticate subsequent SIP requests. Only if that check fails, for is a new challenge sent.
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