# Rest API - Production or Sandbox - Fax numbers not being returned

**URL:** <https://integration.keap.com/t/rest-api-production-or-sandbox-fax-numbers-not-being-returned/46533>\
**Category:** API Q&A\
**Tags:** api\
**Created:** [July 15, 2018, 8:13pm UTC](https://integration.keap.com/t/rest-api-production-or-sandbox-fax-numbers-not-being-returned/46533 "2018-07-15T20:13:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Billy\_Rowe](https://sea1.discourse-cdn.com/flex019/user_avatar/integration.keap.com/billy_rowe/32/6913_2.png) [@Billy\_Rowe](https://integration.keap.com/u/Billy_Rowe)\
**Post date:** [July 15, 2018, 8:13pm UTC](https://integration.keap.com/t/rest-api-production-or-sandbox-fax-numbers-not-being-returned/46533/1 "2018-07-15T20:13:47Z")

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When using the Rest API functions( [List Contacts](https://developer.infusionsoft.com/docs/rest/#!/Contact/listContactsUsingGET), [Retrieve a Contact](https://developer.infusionsoft.com/docs/rest/#!/Contact/getContactUsingGET)) the fax numbers are not being returned.  
I am using an email address with “List Contacts” function and a contact id with the “Retrieve a Contact” function.

Per the above links, the documentation shows that they should be in the response received back.

What am I missing❓

_tia_

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<div class="post-metadata">

**Author:** ![bradb](https://sea1.discourse-cdn.com/flex019/user_avatar/integration.keap.com/bradb/32/13_2.png) [@bradb](https://integration.keap.com/u/bradb)\
**Post date:** [July 16, 2018, 3:07am UTC](https://integration.keap.com/t/rest-api-production-or-sandbox-fax-numbers-not-being-returned/46533/2 "2018-07-16T03:07:03Z")

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Fax numbers is an optional property try adding `?optional_properties=fax_numbers`