External access policies determine whether or not your users can: 1) communicate with users who have Session Initiation Protocol (SIP) accounts with a federated organization; 2) communicate with users who are using custom applications built with [Azure Communication Services](/azure/communication-services/concepts/teams-interop); 3) access Skype for Business Server over the Internet, without having to log on to your internal network; 4) communicate with users who have SIP accounts with a public instant messaging (IM) provider such as Skype; and, 5) communicate with people who are using Teams with an account that's not managed by an organization.
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