R&S M3SR 4100 Series, Operating Manual

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M3SR Series 4100 Voice over IP (VoIP)
5.112 Operating Manual 6175.4760.02 – 01
Figure 5.32 Connection between a Radio Network and a VoIP Telephone
1 Radio 1
2 Radio Network
3 VoIP Gateway Radio
4 IP Network
5 VoIP Telephone
6 Radio 2
With the phone service enabled, if the operator of radio 1 wants to call a VoIP telephone con-
nected to an IP network, the operator can select the phone book entry corresponding to the
desired called party or dial its number from the MMI. This is will be sent over the air to the
VoIP gateway radio, which will translate it into a SIP signalling message. The gateway radio
invites the VoIP telephone for a call session over the IP network.
If the telephone wants to call the radio network, it will call the VoIP gateway radio. The in-
coming call can either be answered by the VoIP gateway radio (automatically or manually)
or by an operator at an endpoint radio, depending on the waveform used inside the radio net-
work and on the definition of the automatic call accept delay parameter via R&S RNMS3000
(see ”Call Initiation” on p. 5.111). In case of a broadcast call all radios can accept or deny the
incoming call.
The call setup procedure starts with the exchange of SIP signalling between the VoIP gate-
way radio and the VoIP telephone, and the exchange of proprietary signalling between the
VoIP gateway radio and the radios if the phone service is enabled. Once the call session is
established, the VoIP telephone is able to communicate with the radio network. Any radio
which was addressed by this call is able to communicate with the VoIP telephone. Moreover,
the VoIP telephone will listen to any communication occurring inside the radio network which
is addressed to the VoIP gateway radio.
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