AASTRA SIP-DECT (Release 1.8)-Installation- and Administration Guide EN - Manual (Page 10)

Installation, Administration and Maintenance
Aastra depl-0900/0.4 Page: 10 (104)
RFP only mode
Within this mode the RFP converts IP protocol to DECT protocol and then
transmits the traffic to and from the handsets over a DECT time slot. On air
the RFP has 12 available time slots, 8 can have associated DSP resources
for media streams, the remaining 2 time slots are used for control signalling
between RFPs’ and the PPs’, and 2 time slots are reserved for hand-in
purposes.
Groups of RFPs’ can be built which are named clusters. Within a cluster
RFPs’ are synchronized to enable a seamless handover when an user
crosses from one RFP’s zone of coverage to another. For synchronization it
is not necessary for a RFP to communicate directly with all other RFPs’ in the
system. Each RFP only needs to be able to communicate with the next RFP
in the chain. But it is preferable for a RFP to see more than one RFP to
guarantee synchronization in the event that one of the RFPs’ fails.
The 2 control signalling channels are also used to carry bearer signals that
signal the handset to start the handover process. If the radio signal of
another RFP is stronger than that of the current RFP, then the handset starts
the handover process to the RFP that has the stronger signal as the user
moves around the site.
OpenMobility Manager mode
In this mode a RFP functions as a regular RFP. Additionally it is responsible
for SIP signalling between the IP DECT system and the telephony or media
server. Further on it takes over the management part of the IP DECT
solution. You designate a RFP as the OMM by assigning an IP address to
the RFP within the DHCP scope (see chapter 3) or by setting the data via the
OM Configurator (see 3.2). After a RFP is designated as the OMM, it starts
the extra services on board (for example, the web service that supports the
management interface). All RFP’s download the same firmware from a TFTP
server but only one RFP activates the OMM services.
Note: It is possible to deactivate the DECT part of a RFP. If the DECT
interface is deactivated then all resources (CPU and memory) are available
for the OMM.