R&S 4200 Series, Operating Manual

Page: 157 / 220

Audio via VoIP (Optional) R&S XU 4200
3.105 6166.5368.02.01
3.15 Audio via VoIP (Optional)
VoIP Mode\VoIP Mode "Radio".doc
This chapter This chapter provides information about the VoIP mode. The R&S S4200
radio offers the possibility of digital audio transmission via voice over
internet protocol (VoIP). VoIP is a protocol driven communication standard.
VoIP is implemented according to EUROCAE ED-137B, part 1.
3.15.1 Introduction/Overview
Introduction This chapter explains basic mechanisms of VoIP communication. VoIP for
Air Traffic Management (ATM) represents an IP communication standard
which is adapted for ATM requirements.
Note: VoIP is used for communication between a voice communication
system (VCS) or the R&S GB4000V over an IP network.
VoIP for ATM VoIP standard uses the following protocols:
 SIP (Session Initiation Protocol)
Application layer protocol for establishing, modifying and terminating
multimedia sessions based on RFC 3261.
 SDP (Session Description Protocol)
Application layer protocol used for defining and negotiation of session
parameters which are used for a two-way RTP communication based on
RFC 4566.
 RTP (Real-Time Transport Protocol)
Application layer protocol used for transporting audio data via network
based on RFC 3550.
 R2S Protocol (R2 Signaling Protocol)
Protocol which offers a mechanism for “Keep Alive” signalling to control the
connection between the VCS or the R&S GB4000V and the radio.