The URN namespace identifier dial-multiscreen-org has not been registered with IANA, as it should be in accordance with RFC 8141. Please send a registration request to the urn@ietf.org discussion list (visit https://www.ietf.org/mailman/listinfo/urn to sign up) by following the instructions in section 6 of RFC 8141: https://www.rfc-editor.org/rfc/rfc8141#section-6
The URN namespace identifier
dial-multiscreen-orghas not been registered with IANA, as it should be in accordance with RFC 8141. Please send a registration request to the urn@ietf.org discussion list (visit https://www.ietf.org/mailman/listinfo/urn to sign up) by following the instructions in section 6 of RFC 8141: https://www.rfc-editor.org/rfc/rfc8141#section-6