438
SIP
438 Invalid Identity Header
The server obtained the certificate from the Identity-Info header but the signature in the Identity header is invalid.
Quando você vê este código
When the cryptographic signature in the Identity header does not match the message content, indicating possible tampering.
Como corrigir
Regenerate the Identity header with a correct signature. Ensure no intermediary is modifying signed headers after signing.
Especificação
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Protocol Deep Dives
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