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Encryption- SIP can encrypt headers and message bodies to prevent a third party from getting information from them. TLS uses hop-by-hop encoding. That is, each hop (UAC to Proxy, Proxy to Location Server, Proxy to UAS, etc.) establishes its own keys with the next hop.

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Posted by crouse

Encryption- SIP can encrypt headers and message bodies to prevent a third party from getting information from them. TLS uses hop-by-hop encoding. That is, each hop (UAC to Proxy, Proxy to Location Server, Proxy to UAS, etc.) establishes its own keys with the next hop.

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Posted by yogendra

Encryption would ensure that only carriers
possessing a particular decryption key are capable of inspecting encapsulated ISUP MIME bodies in a SIP request.

SIP-T endpoints MUST support S/MIME signatures (CMS SignedData), and SHOULD support encryption (CMS EnvelopedData).

And end-to-end encryption achieved in SIP is by SMIME.

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Posted by sagitraz