DAP deployment rules and requirements 33
Dynamic IP network addresses
Network stations, which do not act as servers (PC workstations as well as
DAPs), can use dynamic IP addresses assigned by DHCP. For dynamic
IP addresses, there is no need to specify the MAC addresses of all the
network stations in the DHCP server.
The DHCP server must be configured to assign IP addresses from a
certain range to unknown MAC addresses. The drawback is that unknown
LAN stations get valid IP addresses, which can be a small network security
issue. To overcome this drawback, use the Vendor Class Identification in
the DHCP server. The DHCP server only issues IP addresses to devices
that have the Vendor Class Identification of the DAPs. However, the
DHCP server must be capable of making a distinction in Vendor Class
Identifications. The Vendor Class Identification of the DAPs is D(ECT)AP
49.
ATTENTION
The DAP chosen as the DAP Redirect Server must have a static IP address.
For more information, see “Adding Gateway Endpoint for DAP redirect server”
(page 166).
Each DAP in a SIP DECT system is assigned a dynamic IP addresses.
You can configure the DAPs to store the IP address in Flash memory,
so the DHCP server is required only during the initial configuration of the
system.
Multicast addresses
Multicast is used in SIP DECT systems for the following functions:
• Communication between the SIP DECT network components to locate
or address a handset.
If a handset must be reached, the request must go to all DAPs
simultaneously. For example, if you use the page function during an
incoming call, a single multicast message is sent to all DAPs to find the
DAP for your handset in a fast and efficient way.
•
Seamless hand over from one DAP to the other
If inter-cell hand over is necessary, the media path must be redirected
from the existing DAP, to another DAP. A hand over is always initiated
by the handset. The handset does request on another DAP (not the
DAP where the connection is at the moment). This DAP issues a
multicast on the network to find out on which DAP the voice connection
exists. The DAP, with the existing voice connection, responds and then
the connection can be redirected from the DAP with the existing voice
connection to the new DAP.
Nortel Communication Server 1000
SIP DECT Fundamentals
NN43120-123 01.07
6 January 2009
Copyright © 2008-2009 Nortel Networks
.
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