CommunicationWithExternalOrgs

> Applicable: Lync Server 2010, Lync Server 2013, Skype for Business Server 2015, Skype for Business Server 2019

Indicates how the users get assigned by this policy can communicate with the external orgs. There are 5 options:

• OrganizationDefault: users follow the federation settings specified in TenantFederationConfiguration. This is the default value.
• AllowAllExternalDomains: users are allowed to communicate with all domains.
• AllowSpecificExternalDomains: users can communicate with external domains listed in AllowedExternalDomains.
• BlockSpecificExternalDomains: users are blocked from communicating with domains listed in BlockedExternalDomains.
• BlockAllExternalDomains: users cannot communicate with any external domains.

The setting is only applicable when EnableFederationAccess is set to true. This setting can only be modified in custom policies. In the Global (default) policy, it is fixed to OrganizationDefault and cannot be changed.