SMTP networking refers to messaging between Unity servers that do not share the same
global directory, or messaging to people who do not reside on any voice-messaging server.
The concept of Internet subscribers comes into play when talking about SMTP networking.
An Internet subscriber can have local extensions and recorded voice name and greetings,
and can be listed in the Unity directory. However, this subscriber does not have a local
Exchange mailbox. Instead, it has a reference to an e-mail address.
When a voice message is sent to an Internet subscriber, the message is sent over the Internet
or any ...
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