Encrypt the Signaling Channel

• There is also no standard way to do this

• Alternatives to encrypting the signaling protocol itself include:

• • IPSec to encrypt at the network layer
  • • Not scalable
    • Issues with call set-up times
  • TLS to encrypt at the transport layer
  • • Not end-to-end
    • Issues with trust; no global PKI
  • New protocol: DTLS!