--- title: "Changes to Update a Fax" method: POST path: "/Accounts/{AccountSid}/Faxes/{Sid}" --- # Changes to Update a Fax `POST /Accounts/{AccountSid}/Faxes/{Sid}` > Every recorded change to this endpoint, newest first. ## Timeline Changed in 6 of 40 revisions. - **2026-05-12** `5344c0c93a4c` — 1 breaking, 6 info - **2026-03-04** `2e516ba2383f` — 5 breaking - **2026-01-19** `d5fbaaddfa3e` — 16 breaking, 23 info - **2026-01-15** `a10b019314cd` — 1 info - **2026-01-15** `07f73f74a61d` — 1 breaking, 1 info - **2026-01-15** `3c88f14db21e` — 8 breaking, 1 warning, 22 info ## Changes - **2026-05-12** `5344c0c93a4c` — 1 breaking, 6 info - added 'unevaluatedProperties' constraint to the request body - added 'unevaluatedProperties' constraint to the response body for the status `200` - added 'unevaluatedProperties' constraint to the response body for the status `400` - added 'unevaluatedProperties' constraint to the response body for the status `401` - added 'unevaluatedProperties' constraint to the response body for the status `404` - added 'unevaluatedProperties' constraint to the response body for the status `422` - added 'unevaluatedProperties' constraint to the `links/allOf[#/components/schemas/FaxLinks]/` response property for the status `200` - **2026-03-04** `2e516ba2383f` — 5 breaking - response property `error_code` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - response property `error_message` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - response property `media_url` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - response property `num_pages` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - response property `price` list-of-types was widened by adding types `null` to media type `application/json` of response `200` - **2026-01-19** `d5fbaaddfa3e` — 16 breaking, 23 info - request body became required - the request property `Status` became required - removed the enum value `busy` of the request property `Status` - removed the enum value `delivered` of the request property `Status` - removed the enum value `failed` of the request property `Status` - removed the enum value `no-answer` of the request property `Status` - removed the enum value `processing` of the request property `Status` - removed the enum value `queued` of the request property `Status` - removed the enum value `received` of the request property `Status` - removed the enum value `receiving` of the request property `Status` - removed the enum value `sending` of the request property `Status` - the response property `error_code` became nullable for the status `200` - the response property `error_message` became nullable for the status `200` - the response property `media_url` became nullable for the status `200` - the response property `num_pages` became nullable for the status `200` - the response property `price` became nullable for the status `200` - added the non-success response with the status `400` - added the non-success response with the status `422` - the response property `account_sid` became required for the status `200` - the response property `api_version` became required for the status `200` - the response property `date_created` became required for the status `200` - the response property `date_updated` became required for the status `200` - the response property `direction` became required for the status `200` - the response property `duration` became required for the status `200` - the response property `error_code` became required for the status `200` - the response property `error_message` became required for the status `200` - the response property `from` became required for the status `200` - the response property `links` became required for the status `200` - the response property `links/allOf[#/components/schemas/FaxLinks]/media` became required for the status `200` - the response property `media_sid` became required for the status `200` - the response property `media_url` became required for the status `200` - the response property `num_pages` became required for the status `200` - the response property `price` became required for the status `200` - the response property `price_unit` became required for the status `200` - the response property `quality` became required for the status `200` - the response property `sid` became required for the status `200` - the response property `status` became required for the status `200` - the response property `to` became required for the status `200` - the response property `url` became required for the status `200` - **2026-01-15** `a10b019314cd` — 1 info - request body became optional - **2026-01-15** `07f73f74a61d` — 1 breaking, 1 info - removed the media type `application/json` from the request body - added the media type `application/x-www-form-urlencoded` to the request body - **2026-01-15** `3c88f14db21e` — 8 breaking, 1 warning, 22 info - added the new path request parameter `AccountSid` - added the new path request parameter `Sid` - request body became required - removed the media type `application/x-www-form-urlencoded` from the request body - the `direction` response's property type/format changed from `string`/`` to ``/`` for status `200` - the `links` response's property type/format changed from `object`/`` to ``/`` for status `200` - the `quality` response's property type/format changed from `string`/`` to ``/`` for status `200` - the `status` response's property type/format changed from `string`/`` to ``/`` for status `200` - removed the optional property `links/media` from the response with the `200` status - added the media type `application/json` to the request body - added the non-success response with the status `401` - added the non-success response with the status `404` - added `#/components/schemas/FaxDirection` to the `direction` response property `allOf` list for the response status `200` - added `#/components/schemas/FaxLinks` to the `links` response property `allOf` list for the response status `200` - added `#/components/schemas/FaxQuality` to the `quality` response property `allOf` list for the response status `200` - added `#/components/schemas/FaxStatus` to the `status` response property `allOf` list for the response status `200` - removed the `busy` enum value from the `status` response property for the response status `200` - removed the `canceled` enum value from the `status` response property for the response status `200` - removed the `delivered` enum value from the `status` response property for the response status `200` - removed the `failed` enum value from the `status` response property for the response status `200` - removed the `fine` enum value from the `quality` response property for the response status `200` - removed the `inbound` enum value from the `direction` response property for the response status `200` - removed the `no-answer` enum value from the `status` response property for the response status `200` - removed the `outbound` enum value from the `direction` response property for the response status `200` - removed the `processing` enum value from the `status` response property for the response status `200` - removed the `queued` enum value from the `status` response property for the response status `200` - removed the `received` enum value from the `status` response property for the response status `200` - removed the `receiving` enum value from the `status` response property for the response status `200` - removed the `sending` enum value from the `status` response property for the response status `200` - removed the `standard` enum value from the `quality` response property for the response status `200` - removed the `superfine` enum value from the `quality` response property for the response status `200` --- [Operation](https://skmtc.dev/signalwire/apis/compatibility-api/docs/Accounts/:AccountSid/Faxes/:Sid/post.md) · [API](https://skmtc.dev/signalwire/apis/compatibility-api.md) · [Page](https://skmtc.dev/signalwire/apis/compatibility-api/changes/Accounts/:AccountSid/Faxes/:Sid/post)