Activity › Forums › Salesforce® Discussions › CALL IN and CALL OUT Salesforce® Discussions CALL IN and CALL OUT Posted by Naresh kumar on October 5, 2019 at 10:55 AM what are the terms callin and callout in integration Nikita replied 6 years, 7 months ago 2 Members · 1 Reply 1 Reply Nikita Member October 7, 2019 at 6:05 AM Hi, Callout is any https call that accesses an external URL — some other webservice or website. callin would be the opposite — some external web service or application using the Salesforce API to access Salesforce data. Log In to reply. Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me