- "dfrn-duplex" => ["ucontact", "duplex"],
- "dfrn-ret-aes" => ["ucontact", "ret-aes"],
- "dfrn-site-pubkey" => ["ucontact", "site-pubkey"],
- "dfrn-issued-id" => ["ucontact", "issued-id"],
- "dfrn-id" => ["ucontact", "dfrn-id"],
- "dfrn-aes_allow" => ["ucontact", "aes_allow"],