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M3SR Series 4100
1 GWR station name BETHA
IP host name "gwr_betha"
2 Proprietary protocol (IP over air)
3 GWR station name ALPHA
IP host name "gwr_alpha"
4 Inbound dial
100@gwr_alpha
5 Public telephone network (PSTN)
6 SIP PBX 2 with PSTN connection
7 VoIP network
8 SIP PBX 1, e.g. on a vessel
9 Inbound dial
10 IPoA network (SECOM-V or ALE-3G)
The configuration can be used e.g. to connect a local VoIP network on a vessel with a local
VoIP network on land with a PBX connected to the Public Switched Telephone Network
(PSTN). This would allow calls from extensions of the vessel to private extensions at the
headquarter on land or destinations in the public telephone network and vice versa. The only
limitation is that only one call is possible at time.
Both GWRs must be in one air network and be connected peer to peer over IPoA. This
means that on GWR 'BETHA" the following parameters of GWR "ALPHA" have to be config-
ured:
•
VoIP service "on"
•
Signaling mode "Gateway"
•
SIP settings
•
BOA (broadcast on air) Gateway address of the remote radio
The same has to be done on "ALPHA" using the values of "BETHA".
In the dial plan of PBX 1 a prefix must be configured which routes calls to the GWR gw_beta.
GW_beta forwards the request to gw_alpha using the proprietary protocol. GW_alpha sends
an SIP invite to the PBX which decides based on dial prefixes if the call has to be forwarded
to the PSTN or if one of the local extensions has to be called.
Calls from land to sea are going the same way, the only difference is being, that only exten-
sions are available (no routing to other networks).
5.108
Voice over IP (VoIP)
Operating Manual 6175.4760.02 – 01
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