Dear Sirs, let me inform you that we have activated support for a mailing address on test environments, which also caused to make the schema change and the necessary co-operation on your side. We plan to make this change in production systems in the second week in January 2018, we will inform you about the exact date. To increase the certainty that the above change will take place without complications, please pay attention to the following instructions and do the following tests on the test environment. Even if you do not plan to use a mailing address, a return value for info_contact will contain it for objects that will have it completed in the registry. You can already test info_contact operation for a contact with a mailing address with a contact we have created: CONTACT-TEST-MAILING-ADDR. We have also made the necessary changes in the fred-client which can be downloaded at: https://www.nic.cz/page/744/registracni-system/ - FredClient scripts - new version <https://www.nic.cz/files/nic/doc/fred-client-2.9.0-rc2.tar.gz> Changes in fred-client are described in doc/README_ [CS | EN]. [txt | html] (Chapter 9. Client Version 2.9 - Mailing address in contact) Incompatible changes should only be made for the command-line interface of the fred-client when using positional parameters and concurrent entering the cltrid parameter because the mailing address was in this input mode added before cltrid, e.g.: create_contact CONTACT-TEST 'Jane Doe' jane.doe(a)nic.cz 'Unknown 42' 'Twin Peaks' "" CZ NULL NULL NULL +420.111111111 () NULL () NULL (("Milesovska Praha" "CZ)) cltrid-000001 The same should apply for update_contact. It is true that you should upgrade to new schemas and if you use fred-client (in any way) then upgrade also the fred-client. If you do not do it (e.g. because you do not plan to use a mailing address), then in case of a reply to info_contact of the contact that has it configured, you will not be able to validate your reply via the old schemas. So, we especially recommend that you test everything on the test. What to do in points: 1. Download new schemas in case you want on your side to validate requests or answers from us - https://www.nic.cz/files/nic/doc/schemas-2.4.0.zip     a) If you are using our client or its library, then download and install fred-client - https://www.nic.cz/files/nic/doc/fred-client-2.9.0-rc2.tar.gz     b) Read doc/README_ [CS | EN]. [txt | html] chapter about mailing address 2. Configure the system for new schemas (see 1.) 3. Test communication at least for commands (create_contact, update_contact, info_contact) even if you do not plan to have a mailing list 4. Make the appropriate changes in your systems if you want to work with a mailing address 5. Test communication against our test environment 6. Deploy new schemas into your production systems (you can do it already after successful testing at any time, at the latest on the date we make the change in January). If you have any questions, please contact me. Marketa Kusickova -- Markéta Kušičková CZ.NIC, z.s.p.o. Milešovská 5 130 00 Praha 3 T +420 222 745 125 M +420 603 826 732