In relation to the VCS, the set of rules configured system-wide (either via the web interface or CPL script) that determine the action(s) to be applied to calls matching
a given criteria.

Alias

The name an endpoint uses when registering with the VCS. Other endpoints can then use this name to call it. An endpoint may register with more than one alias.

Alternate

One or more VCSs configured to support the same zone in order to provide redundancy.

AOR
Address of Record

A SIP or SIPS URI that points to a domain with a location service that can map the URI to another URI where the user might be available. Typically, the location
service is populated through registrations. An AOR is frequently thought of as the “public address” of the user.

ARQ
Admission Request

An endpoint RAS request to make or answer a call.

Assent

TANDBERG’s proprietary protocol for firewall traversal.

Border Controller

A TANDBERG device used to control multimedia networks and firewall traversal.

Call Policy

The set of rules (administrator policy, user policy and transforms) that are applied to a single call to determine whether and how it is placed.

CLI
Command Line Interface

A text-based user interface used to access the VCS.

Cluster

A collection of between two and six VCSs that have been configured to work together as a single Local Zone, in order to provide scalability and redundancy.

CPL
Call Processing Language

An XML-based language for defining call handling. Defined by RFC 3880 [

Default Subzone

A subzone used to represent locally registered endpoints and systems that do not fall within any other existing configured subzones within the Local Zone.

Default Zone

A configurable zone on the VCS used to represent incoming connections from endpoints that are not recognized as belonging to any of the existing configured
Neighbor, Traversal Client or Traversal Server Zones.

DNS
Domain Name System

A distributed database linking domain names to IP addresses.

DNS zone

On the VCS, a zone used to configure access to endpoints located via a DNS lookup.

E.164

An ITU standard for structured telephone numbers. Each telephone number consists of a country code, area code and subscriber number. For example, TANDBERG’s
European Headquarters’ phone number is +47 67 125125, corresponding to a country code of 47 for Norway, area code of 67 for Lysaker and finally 125125 to
determine which phone line in Lysaker.

ENUM
tElephone NUmber Mapping

A means of mapping E.164 numbers to URIs using DNS.

ENUM zone

On the VCS, a zone used to configure access to endpoints located via ENUM.

External Manager

The remote system that is used to manage endpoints and network infrastructure. The TANDBERG Management Suite (TMS) is an example of an external manager.