Encrypts an invite response with two-layer encryption.
Layer 1 (inner): Payload encrypted with DH key, then encrypted with shared secret. Layer 2 (outer): Envelope encrypted with random key -> inviter ephemeral key.
Encrypts an invite response with two-layer encryption.
Layer 1 (inner): Payload encrypted with DH key, then encrypted with shared secret. Layer 2 (outer): Envelope encrypted with random key -> inviter ephemeral key.