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The AuthenticationInfo.ExternalSourceType enumeration indicates the nature of the source of the message. Valid if the message arrived from the external network. Valid on Internal servers only.
The nature of the external source is unknown.
A remote user.
A forwarding proxy.
A federated peer that is configured using the domain and fully qualified domain name (FQDN) of the server in the Allow list on the Access Edge Server.
A clearing house.
If generated locally by the Access Edge Server.
A federated peer configured as an IM Provider on the Access Edge Server.
A federated peer that is configured using only the domain in the Allow list on the Access Edge Server, or a federated peer discovered through DNS SRV.
Redistributable: Requires Microsoft Office Communications Server 2007
Assembly: ServerAgent (in ServerAgent.dll)