Aastra SIP-DECT Installation And Administration Manual page 12

Installation, Administration and Maintenance
OMM
(RFP in OMM mode)
A call from one PP to another that resides on the same RFP will loop back
within the RFP, if no media gateway is involved. So the call will not pass
through to the Local Area Network (LAN). Although the voice packets will not
impact LAN traffic, signal packets will.
It is also be possible to direct the media stream to connect directly the IP
phone and the RFP, as shown in the following figures.
Aastra Telecom
Signalling
RFP Control Interface
RTP/RTCP
Media Server
Media Gateway
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