I am new to MS CRM 2015. I am trying to get guid using the telephone1 but i have not found any web api as we have in 2016. In MS CRM 2016 i am using the following APi to get the contact idhttp://CRMURL/api/data/v8.0/contacts?$select=telephone1&$filter=telephone1%20eq%20%279091%27
it is working with 2016 but same api is not working with MS 2015. anyone of you please help me to identify the equivalent api in 2015 to get contact id. I am using on-premises CRM. Thanks in advance.