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Normal Mode and Local Mode operation 165
IP Phone calls
When an IP Phone calls another IP Phone, each telephone receives the
address of the other to exchange media directly between the telephones.
Also note that when in Normal Mode, an MG 1000B IP Phone calling a main
office IP Phone does not require any trunking to setup the call. However,
LAN/WAN bandwidth is used to provide a media path for the call. For more
information on Direct IP media path functionality, see IP Peer Networking
Installation and Commissioning (NN43001-313) .
Zones
A zone is a collection of IP Phones that:
•
share similar IP bandwidth restrictions
• are geographically close to one another
•
are all in the same time zone
•
are all in the same PSTN dialing plan
For dialing plan purposes, all telephones in the same zone are treated
identically. Each IP Phone is assigned to a zone during configuration.
IP Phones at a Branch Office are configured within a unique zone. In the
main office Call Server, IP Phones at the Branch Office are assigned to a
Branch Office zone to define the numbering plan for local, long-distance
(optional), and emergency services calls. Zone configuration modifies the
dialed digits so a local, long-distance (optional) or emergency services
call can be sent to a NRS as a long-distance call. Zone configuration data
enables the main office Call Server to modify the dialed digits for these types
of calls initiated from an MG 1000B telephone. The NRS then provides the
endpoint information to route the call to the Branch Office.
ATTENTION
Throughout this document, the term "zone" is defined as a Bandwidth
Management Zone, not a Gatekeeper Zone. Refer to "Bandwidth Management"
(page 55).
Vacant Number Routing
Vacant Number Routing (VNR) is mandatory in a Branch Office. If a vacant
number is dialed, the number is not treated as invalid, and the call is routed
to the Gatekeeper. The Gatekeeper tries to determine where the terminal
is located. If the terminal is located, the call is routed to the terminating
location. If the terminal cannot be located, each of the alternate routes will
be tried, in the configured sequence. If all alternate routes fail, the call is
blocked.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.