| Version | Date | Contact | Remarks |
| R1 | 2012-Feb-08 | Dexter B. Tad-y | – Initial draft |
| R2 | 2012-Jul-25 | Dexter B. Tad-y | – Added Introduction, Overview and DeliveryReceipt-v1 sections |
| R3 | 2012-Oct-16 | Dexter B. Tad-y | – Added Message.usagetype description relating to MT-billing – Updated description of Message.from and Message.to fields – Updated definition of DeliveryReceipt.delivered field – Updated Connection Handling policies |
| R4 | 2012-Nov-7 | Dexter B. Tad-y | – Renaming of “Message” resource to “Document” resource; for consistency across internal systems; – Deprecated “Message-v1” resource; “Document” resource is set to version v3; for consistency across internal systems; – Rewrite of Assumptions and Connection Handling text for clarity – Updated HTTP Signed Request Appendix text for clarity |
| R5 | 2013-Mar-19 | Jacyn C. Campasa | – Added MGW Reason Code and Reason Description for MT Delivery Receipt (v2 – backwards compatible to v1) |
| R6 | 2014-Dec-10 | Dexter B. Tad-y | – Added from_alias field |
| R7 | 2016-Oct-20 | Jacyn C. Campasa | – Added Basic Access Authentication (RFC 2617) – Deprecated MCWS Authentication |
| R7.1 | 2017-Dec-8 | Wilson Santos | – Clarify Message.id usage – Clarify MSISDN formatting rules |
| R8 | 2018-Feb-9 | Jacyn C. Campasa | – Renaming of Message.message_id to Message.id on Resource examples – Added additional MGW Reason Code & Reason Description for MT Delivery Receipt |
| R8.1 | 2018-Oct-4 | Dexter B. Tad-y | – Clarify HTTP Redirection semantics – Clarity Rate Limit Policy |
