Nortel Networks NN43001-314 - Manual (Page 34)

34 Overview
• The MG 1000B Expander is connected to the MG 1000B Core with
copper wire. Therefore, the back of the MG 1000B Expander does not
have an Ethernet port.
Figure 3 "MG 1000B Core/MG 1000B Expander" (page 32) shows the MG
1000B Expander. Table 3 "Card slots for MG 1000B Core and MG 1000B
Expander" (page 32) gives the card slots for the MG 1000B Expander.
Signaling Server
The Signaling Server is required for the Branch Office feature. It provides
the following functions:
• IP Peer Networking, incorporating:
— SIP and H.323 Gateways
— Network Routing Service (NRS), consisting of:
– SIP Redirect Server
– H.323 Gatekeeper
– Network Connection Service (NCS)
• IP Phone registration to the IP Phone Terminal Proxy Server (TPS)
during Local Mode for survivability
• Web server for Element Manager and NRS Manager
A second Signaling Server can be used to provide redundancy in the case
of a failure in the other Signaling Server at the Branch Office. The NRS
must reside on the Leader Signaling Server.
A network requires one NRS. However, Nortel recommends that an
Alternate NRS, and in some cases at least one Failsafe NRS, be configured
in the network. In a Branch Office network, configuring a Primary or
Alternate NRS at a Branch Office location is not appropriate due to possible
network outages. For maximum coverage, Nortel recommends that a
Failsafe NRS be configured at each Branch Office location that is not
otherwise configured with a Primary or Alternate NRS.
In a SIP-enabled system, the Signaling Server supports only en bloc
signaling.
In an H.323-enabled system, the Signaling Server supports both en bloc
and overlap signaling. En bloc signaling is standard. If overlap signaling is
to be used, Nortel highly recommends that it be installed and enabled on all
Signaling Servers in the network. Failure to do so results in delays in call
completion due to overlap to en-bloc conversion.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.