Mitel 5320 Reference Manual page 127

Virtual Path Identifier. This is part of the definition of a PVC in an ATM connection. A
PVC is uniquely identified by its VCI and VPI (usually written in the form ccc.ppp where
ccc is the VCI and ppp is the VPI).
Voicemail system
a device used for storage and retrieval of subscriber's voicemail.
Zone
A logical entity that associates sites with dial plans and CallP servers. Zones contain
route entries that determine the physical routing of outgoing calls from the system.
Glossary of Terms 121