Nortel Networks NN43001-314 - Manual (Page 167)

Normal Mode and Local Mode operation 167
ATTENTION
IMPORTANT!
If you are using one Access Code for both local and long-distance calls, and
that Access Code is associated with a Branch Office zone, all calls (local and
long-distance) are routed through that Branch Office.
For more information, see "Dialing plan configuration" (page 291) .
IP Phone to analog (500/2500-type) or digital telephone calls
When an MG 1000B IP Phone in Normal Mode calls an analog
(500/2500-type) or digital telephone in the Branch Office, the call is
processed at the main office Call Server. A Virtual Trunk route is selected
according to the digits dialed. The call is routed over a Virtual Trunk to
the Branch Office. The MG 1000B Call Server processes the incoming
Virtual Trunk call and terminates it to the local analog (500/2500-type)
or digital telephone. Since this is a call between IP and circuit-switched
devices, a DSP resource on a Media Card is allocated and connected to
the analog (500/2500-type) or digital telephone. The IP address of the DSP
resource is returned to the main office Call Server so a direct media path
between the IP Phone and the DSP resource can be set up when the call is
established. Refer to IP Peer Networking Installation and Commissioning
(NN43001-313) for details.
Incoming calls from the local PSTN
The Vacant Number Routing (VNR) feature must be configured on the
MG 1000B Call Server to route all vacant numbers to the main office. An
incoming Central Office trunk call can be configured to terminate at the
local attendant console, an analog (500/2500-type) telephone, or a digital
telephone. It can also be routed to a remote attendant console, an MG
1000B IP Phone, or an analog (500/2500-type) or digital telephone in the
main office. Direct-Inward-Dial (DID) calls from local PSTN trunks are
routed according to the destination DNs. Incoming calls to MG 1000B IP
Phones in Normal Mode are routed to the main office Call Server over the
Virtual Trunks. Calls to local analog or digital devices are terminated locally.
Conference calls
When a branch user initiates a conference call while registered in local
mode, the conference facilities of the main office are used. This means that
in a conference among three Branch Users, the LAN/WAN bandwidth of
three media paths is used. The main office controls the calls except in Local
Mode, where local resources are used.
In sites with limited LAN/WAN bandwidth between the main office and the
Branch Office and with heavy conference traffic among Branch Users, you
can install the Nortel Integrated Conference Bridge card in the MG 1000B
Core or the MG 1000B Expander. This configuration provides a meet-me
conference facility and reduces LAN/WAN bandwidth usage requirements.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.