Nortel CS 1000 Manual page 30

30 Site planning and hardware deployment
Branch Office Configuration is used for a Large Campus network
that is split into various (geographical) segments (branch offices). IP
multicast must be able to occur between all DAPs in every branch
office and no IP multicast is allowed between any two branch offices.
In this configuration, each branch office behaves as an isolated site
of a large SIP DECT system. Branch Office configuration supports
seamless handover within each isolated site (branch office), but not
between sites. Support is unavailable for roaming between branch
offices. For an illustration of a Branch Office Configuration, see
7 "Branch Office Configuration" (page
Figure 7
Branch Office Configuration
For Branch Office Configuration, network settings must comply with
the following requirements:
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The network between Branch Offices and Call Server must support
QoS.
Branch Offices must be in separate subnets (IP router(s) needed).
DAPs in various Branch Offices must be located so that no
synchronization can occur between any two DAPs belonging to
various Branch Offices.
Routers must block IP multicast between Branch Offices (multicast
TTL = 1, which means that IP multicast packets do not cross IP
routers).
Nortel Communication Server 1000
SIP DECT Fundamentals
NN43120-123 02.02 30 March 2010
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30).
Figure