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Changes from -03 Deleted the open issue about labeling a body destined for “middle” A new SIP header “Proxy-Required-Body” Changed a response code for requiring a signature A new response “495 Signature required” Changed how to protect a label and its constraint -03: Signature for a body which includes a label within sipfrag was SHOULD. -04: TLS is now SHOULD and the signature for sipfrag is MAY. A proxy server trusted to provide SIP routing is generally trusted to process all SIP headers. Therefore, hop-by-hop security is reasonable for the protection. Deleted the open Issue about removing a label by proxy before forwarding It is allowed to remove a label depending on security policies of providers. Updated reference |