AASTRA SIP-DECT (Release 2.1)- OM System Manual - Installation, Administration and Maintenance EN - Manual (Page 9)

SIP – DECT OM System Manual Release 2.1 1 Overview
depl-1230/1.3 Page: 9 (196)
Clusters
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 area of
coverage to another. For synchronization it is not necessary for an RFP to see directly all
other RFPs in the system. Each RFP only needs to be able to see the next RFP in the chain.
But it is preferable for an RFP to see more than one RFP to guarantee synchronization in the
event that one of the RFPs fails.
1.2.2 OpenMobility Manager (OMM) Mode
If the OMM shall not run on a dedicated Linux PC then one RFP within a SIP – DECT
installation must be declared to operate as the OpenMobility Manager (OMM). The RFP
acting as the OMM may also act as a regular RFP as well if it is included into a DECT
cluster.
In OMM mode an RFP functions as a regular RFP. Additionally it is responsible for SIP
signaling between the SIP – DECT system and the IP PBX/media server. Further on it takes
over the management part of the SIP – DECT solution. You designate an RFP as the OMM
by assigning an IP address to the RFP within the DHCP scope (see chapter 7.5) or by setting
the data via the OM Configurator (see 7.6). After an RFP is designated as the OMM, it starts
the extra services on board (for example, the web service that supports the management
interface). All RFPs 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 an RFP. If the DECT interface is
deactivated then all resources (CPU and memory) are available for the OMM.
1.3 About the OpenMobility Manager
The OpenMobility Manager (OMM) runs on one of the RFPs or on a dedicated Linux PC.
There is only one active OpenMobility Manager (OMM) in the system.
1.3.1 OMM Tasks
The OMM performs the following tasks:
• Signaling gateway (SIP <-> DECT)
• Media stream management
• Managing sync-over-air functions between RFPs
• Provides a Web service for system configuration
• Provides additional services e.g.
- LDAP based central corporate directory
- OM Application XML interface (OM AXI) for OAM&P,
messaging, alerting service and locating
- Integrated Messaging and Alerting Service (OM IMA)
- Data backup and provisioning services