Understanding VPIM Networking 287
Internet subscribers have certain limitations in terms of using Cisco Unity. They cannot log on
to Cisco Unity either over the phone or using Cisco Unity Assistant. As a result, they cannot
adjust personal settings identiﬁed earlier in Figure 10-20. In addition they cannot use VMO or
Cisco Unity Inbox. The underlying reason for these limitations is that Internet subscribers do
not have a local mailbox in Exchange.
Understanding VPIM Networking
VPIM is a standard used by different messaging systems to exchange voice, fax, and text
messages among different systems over the Internet or a TCP/IP network. VPIM networking
enables Cisco Unity to exchange this type of information with other systems that are also using
VPIM. This section presents the basic concepts and procedures involved with VPIM
networking and Cisco Unity.
If your organization needs to exchange messages between Cisco Unity and a VPIM-compliant
messaging server, then you need to understand how VPIM works and the procedures for setting
it up in Cisco Unity. Once it is set up, callers will have a transparent experience when messaging
across the systems.
To beneﬁt fully from this section, it is recommended that you have these prerequisite skills and
• Knowledge of the standard and optional Cisco Unity features (see Chapter 1)
• Knowledge of how Cisco Unity messaging handles calls (see Chapter 2, “Using Your
Cisco Uniﬁed Communications System”)
• Understanding of the concepts presented in the “Cisco Unity Networking Fundamentals”
section of this chapter
VPIM Networking and VPIM Messages
VPIM is a standard that was introduced in the industry for the intended purpose of having a
common format for exchanging different types of messages digitally among messaging
systems. It is based on the SMTP and MIME protocols. Voice, fax, and text can be exchanged
over the Internet or on a TCP/IP network. As a result, organizations can potentially save on
long-distance toll charges for messages sent among messaging systems.
VPIM deﬁnes the format of the messages, the protocols used, and the message addresses
exchanged between two VPIM-compliant messaging systems. It is up to the messaging servers
to specify how these messages are handled and presented to the end users. The type of client
application used is an example of an item that varies depending on the actual messaging system
used. Some servers may provide access to these messages through a telephone, an e-mail client
application, or both. More information about the VPIM standard is available at http://
288 Chapter 10: Uniﬁed Communications Networking
VPIM networking is a licensed feature in Cisco Unity and is used with Microsoft Exchange 5.5/
2000 integrations. If multiple Cisco Unity servers are networked together, then only one Cisco
Unity server requires the VPIM license and conﬁguration for VPIM networking. Licensing
information can be viewed by using the Cisco Unity License Manager.
Figure 10-21 shows where you can check whether you are licensed for VPIM.
Figure 10-21 VPIM Licensing
VPIM messages can contain several different types of MIME-encoded pieces, such as a voice
message, a fax message, a text message, the sender’s spoken name, or even a vCard, which is
an electronic business card.
TIP Cisco Unity can be conﬁgured to include the spoken name and vCard for outgoing messages.
This is set using the Cisco Unity Administrator tool on the VPIM Delivery Location page.
For incoming messages, Cisco Unity allows the spoken name to be included in the message if
it is attached as a WAV ﬁle. This means, for example, that when a subscriber receives a voice
message, the subscriber can hear the spoken name of the sender ﬁrst, then the actual voice
message. In addition, a vCard sent to Cisco Unity can be viewed from a subscriber’s Outlook
client using VMO. Voice messages that are sent across VPIM are encoded using the
International Telecommunication Union (ITU) G.726 Adaptive Differential Pulse Code
The VPIM License is
Shown on the License
Manager. It is either
Licensed or Turned Off.
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