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Networking Guide for Cisco Unity Release 5.x (With Microsoft Exchange)
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Chapter 7 VPIM Networking
Procedures for Setting Up Cisco Unity to Use VPIM Networking
• Choose the Exchange (or relay) server that will handle outgoing messages to the remote voice
messaging system.
• Choose the Exchange server(s) on which to install the Voice Connector and the VPIM Transport
Event Sink. Write down the FQDN and IP address of the Exchange server(s).
• Write down the FQDN and IP address of the Exchange (or relay) server(s) that handle incoming
SMTP messages.
Determining the Domain Name
VPIM messages are addressed in the format <Mailbox Number>@<Domain Name>. In order for
messages to be exchanged between the remote voice messaging system and Cisco Unity, you will need
to decide on the domain name that the remote voice messaging system will use when addressing
messages to Cisco Unity subscribers. The domain name will be configured as follows:
• On the remote voice messaging system on the location or node profile that corresponds to
Cisco Unity. (Refer to the documentation for the remote voice messaging system for additional
information.)
• On the SMTP Domain field, during the installation of the VPIM Transport Event Sink.
• On the SMTP Domain Name field on the Network > Primary Location page in the Cisco Unity
Administrator.
• In the recipient policy for the Voice Connector Exchange mailbox.
If the remote voice messaging system location or node profile that corresponds to Cisco Unity has
already been configured with a domain name, use that domain name in the procedures that follow.
Otherwise, consult with the Exchange administrator for your organization to determine an appropriate
domain name to use.

Domain Name Requirements

The domain name uniquely identifies the messaging system. When choosing domain names used by
Cisco Unity and the remote voice messaging system, keep the following in mind:
• Cisco Unity and the remote voice messaging system cannot use the same domain name; each system
must use a unique domain name.
• The complete domain name used by Cisco Unity cannot be a subset of the domain name used by the
remote voice messaging system. For example, if Cisco Unity is using the domain name cisco.com,
the remote voice messaging system cannot use names like london.cisco.com, paris-cisco.com, or
romecisco.com. However, you could use europe.cisco.com for Cisco Unity, and then use the names
london.cisco.com, paris-cisco.com, and romecisco.com.
Caution Choosing a domain name that does not meet these requirements will result in message delivery failure.
Resolving Names with IP Addresses
VPIM messages are sent over the Internet or any TCP/IP network via SMTP. Therefore, some
mechanism for name resolution is required for the remote voice messaging server and the Exchange (or
relay) servers that handle incoming and outgoing SMTP messages. (Depending on your network, this
may or may not be the same Exchange server on which the Voice Connector and the VPIM Transport