Instruction manual

Networking and connectivity
555-233-767130 Issue 4 May 2003
E911 CAMA trunk group
This form administers the Centralized Automatic Message Accounting (CAMA)
trunks and provides Caller Emergency Service Identification (CESID)
information to the local community’s enhanced 911 system through the local
central office.
Foreign Exchange (FX)
Foreign Exchange (FX) trunks connect Communication Manager to a Central
Office other than the local one.
ISDN trunks
Gives you access to a variety of public and private network services and facilities.
The ISDN standard consists of layers 1, 2, and 3 of the Open System Interconnect
(OSI) model. Systems running Communication Manager can be connected to an
ISDN using standard frame formats: Basic Rate Interface (BRI) and the Primary
Rate Interface (PRI).
An ISDN provides end-to-end digital connectivity and uses a high-speed interface
that provides service-independent access to switched services. Through
internationally accepted standard interfaces, an ISDN provides circuit or
packet-switched connectivity within a network and can link to other ISDN
supported interfaces to provide national and international digital connectivity.
Automatic Termination Endpoint Identifier (TEI)
The user side will support automatic TEI assignment by the network. Both fixed
and automatic TEI assignment will be supported on the network side.
Call-by-call service selection
Enables a single ISDN-PRI trunk group to carry calls to a variety of services,
rather than requiring each trunk group to be dedicated to a specific service. It
allows you to set up various voice and data services and features for a particular
call.