Installation, Administration and Maintenance
Aastra Telecom Page: 11 (47)
2.3 OpenMobility Manager
The OpenMobility Manager (OMM) performs the following tasks:
• Signalling gateway (SIP <-> DECT).
• Media stream management.
• Managing sync-over-air functions between RFPs.
• Facilitating system configuration modifications.
The OpenMobility Manager (OMM) runs on one of the RFP’s.
2.4 IP signalling and media stream
To establish a call between an IP Phone and a PP (Aastra DECT 142
Handset), the following IP streams must be established:
• A signalling channel to and from the SIP phone.
• A signalling channel to and from the OMM.
• A control interface between the OMM and the RFP that has a connection
to the PP (known as the primary RFP).
• A Real Time Protocol (RTP) / Real Time Control Protocol (RTCP)
connection between the SIP phone and the media gateway and then a
RTP/RTCP connection between the media gateway and the RFP.
The following figure illustrates this scenario.
Media Server
Media Gateway
Signalling
RFP Control Interface
RTP/RTCP
SIP-Phone
OMM
(RFP in OMM mode)
Primary RFP
To establish a call between two PPs the same IP streams must be
established like in the scenario before, except the IP phone is not involved.
The following figure illustrates this scenario.
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