Openmobility Manager; Ip Signalling And Media Stream - Aastra SIP-DECT Installation And Administration Manual

Installation, Administration and Maintenance
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.
SIP-Phone
OMM
(RFP in OMM mode)
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.
Aastra Telecom
Media Server
Media Gateway
Signalling
RFP Control Interface
RTP/RTCP
Primary RFP
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