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Networking Guide for Cisco Unity Release 5.x (With Microsoft Exchange)
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Chapter 7 VPIM Networking
VPIM Concepts and Definitions
Phone Prefixes
Each VPIM delivery location provides the following prefixes, which are used to accommodate various
numbering plans:
• Remote Phone Prefix—This number is used to construct addresses for users at a VPIM location. On
outgoing messages to the VPIM location, the Voice Connector adds the prefix to the beginning of
the recipient mailbox number to form the To address. On incoming messages from the VPIM
location, the Voice Connector removes the prefix from the beginning of the sender mailbox number
to form the From address.
• Cisco Unity Phone Prefix—This number is used to construct addresses for Cisco Unity subscribers.
On outgoing messages to the VPIM location, the Voice Connector adds the prefix to the beginning
of the sender mailbox number to form the From address. On incoming messages from the VPIM
location, the Voice Connector removes the prefix from the beginning of the recipient mailbox
number to form the To address.
If all VPIM delivery locations have a unique domain name, prefixes are optional. If you have multiple
delivery locations with the same domain name, the Remote Phone Prefix is required. Within the set of
delivery locations with the same domain name, the Remote Phone Prefix must be a unique number.
For example, assume that an organization has implemented a 10-digit numbering plan, in which the
mailbox numbers for Cisco Unity subscribers begin with 206, and the mailbox numbers of subscribers
on a VPIM voice messaging system begin with 425.
Assume the following has been set on the VPIM delivery location:
• Dial ID = 425
• Remote Phone Prefix = 425
By setting both the Remote Phone Prefix and the Dial ID to 425, the number that a subscriber enters
when blind addressing a message to someone at the VPIM location is the same number that the
subscriber enters when calling the person.
Because of the prefix, VPIM subscribers are assigned a 7-digit Remote Mailbox Number. In this
example, for outgoing messages the Voice Connector would add the prefix 425 to the beginning of the
remote mailbox number, creating a 10-digit recipient mailbox number.
Audio Format Considerations
The Audio Format Conversion settings on the VPIM delivery location page in the Cisco Unity
Administrator allow you to control the audio format of outgoing and incoming VPIM messages, as
follows:
• Outbound Messages—You can set whether outbound VPIM messages are converted to G.726 or sent
in the format in which they were recorded (no audio format conversion).
• Incoming Messages—You can set whether incoming VPIM messages are converted to G.711
(mu-law), GSM 6.10, G.729a, or stored in the format in which they were sent (no audio format
conversion).
To make decisions about these settings, consider the following:
• The audio format that the local Cisco Unity server (or servers, if there are multiple Cisco Unity
servers networked together) uses for recording and playing voice messages.