Aastra SIP-DECT Installation And Administration Manual page 13

Installation, Administration and Maintenance
If the PP user is moving, the PP detects that another RFP has a better signal
strength and, therefore, it starts the handover process. The media stream
from the IP phone cannot move to the secondary RFP, so the primary RFP
uses the LAN to direct the voice to the secondary RFP, as shown in the
following figure.
SIP-Phone
OMM
(RFP in OMM mode)
As the PP user moves into the next RFP zone of coverage, the PP detects
that the RFP has a better signal strength. Again the media stream from the
SIP phone cannot move to the secondary RFP, so the primary RFP uses the
LAN to direct the voice to the new secondary RFP.
Aastra Telecom
Signalling
RFP Control Interface
RTP/RTCP
Media Server
Media Gateway
Secondary RFP Primary RFP
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