Nortel Networks NN43001-314 IP Phone to analog (500/2500-type) or digital telephone calls, Incoming calls from the local PSTN, Conference calls

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 facilitiesof 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 facilityand reduces LAN/WANbandwidth usage requirements.

Nortel Communication Server 1000

Branch Ofﬁce Installation and Commissioning

NN43001-314 01.02 Standard

Release 5.0 20June 2007