48 Planning and Installation Guide ShoreTel IP Phone 930D
Reference Material Synchronization
5
Each handset will use the MGCP endpointID of “SHOR_aabbccddeeff@www.xxx.yyy.zzz” where
aabbccddeeff is the 40-bit IPUI of the handset (extended to 48-bits by pre-pending the value 0x02 in
hex format) and www.xxx.yyy.zzz is the handset IP address. On an IP 230, the phone’s MAC address
is used for the aabbccddeeff field. (ShoreTel Director uses the endpoint ID reported by the MGCP
RSIP sent by the base.)
When managing IP930D handsets in Director, the IPUI of the handset (found on a label under the
battery or accessible from the Setup Menu) can be used to link physical handsets to the information in
Director. An IP930D handset with an IPUI of 116E5001FB will be reported by Director to have a MAC
address of 02116E5001FB (pre-pended 02).
Synchronization
This section contains information about synchronization.
Call Handoffs and Synchronization
Although call handoffs between bases are not supported in the system, handoffs do occur between a
base and its repeaters.
When more than one base is used to create a system, it is called a multicell system. To maximize the
channel capacity in such a system, it is necessary for all bases and repeaters in the system to be
synchronized with each other. Synchronization is also required for seamless handoffs between the
base and its repeaters.
The IP930D system uses over-the-air synchronization and syncing relationships between bases will be
determined automatically by the system. This method is preferred because it improves reliability over a
manual static configuration that cannot adapt to propagation changes or equipment failures.
The syncing relationship for repeaters is simple and a static manual configuration must be used.
All bases in a multicell system must be assigned the same DectSysChainId. In the unlikely event that
multiple multicell systems are sharing the same subnet (or multicast forwarding is enabled between
different subnets) they must each be assigned a unique ID (this could happen if a subnet covers a very
large area and two independent and spatially distant multicell systems are installed that share the
same subnet or multicast domain.)
Understanding DECT Synchronization Modes
DECT uses a radio protocol “Multi Carrier, Time Division Multiple Carrier, Time Division Duplex” or
MC/TDMA/TDD. This provides a total of 60 duplex channels in the US and Canada and 120 duplex
channels in other regions. To achieve this channel usage, all bases and repeaters in a system need to
be synchronized in the time domain. Synchronization is also required for handovers between bases
and repeaters.
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