AASTRA SIP-DECT (Release 1.8)-Installation- and Administration Guide EN - Manual (Page 12)

Installation, Administration and Maintenance
Aastra depl-0900/0.4 Page: 12 (104)
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.
• Provides additional services e.g.
-
Corporate directory (LDAP based)
The OpenMobility Manager (OMM) runs on one of the RFPs’.
2.4 IP signalling and media stream
To establish a call between an IP Phone and a PP (Aastra DECT 142
Handset / Aastra 142d), 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 primary RFP.
The following figure illustrates this scenario.
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.