Calls from the terrestrial telephone network (PSTN) to an Inmarsat network are made using the Inmarsat +870 international dialing code. If you are trying to find information on Inmarsat Satellite Network Routing then look no further! Phone calls and data connections are routed by the international telecoms carriers based on the numbering formats described here.
The Inmarsat network is split into three satellite constellations.
The Inmarsat network supports voice phone calls, SMS text messaging, circuit-switched data, fax, Standard IP and Streaming IP.
Telephone calls from the terrestrial telephone network (PSTN) to an Inmarsat network are made using the Inmarsat +870 single number access code, which is the same as a country code number.
The full Inmarsat E&E numbering format, a dual T digit format, is as follows:
+870 t1, t2, x1, x2, x3, y1, y2, y3, y4 where,
+870 is the country code
t1, t2 are the two T- digits indicating that it is an Existing and Evolved call.
NDC (National Destination Code) or leading digits of N(S)N (National (Significant) Number)
N(S)N number length
Usage of E.164 number
Additional service information
30 – 37
Maritime mobile normal calls
Land mobile normal calls
Land and maritime high-speed data calls
50 – 57
Maritime mobile ISDN calls
61 – 67
68 – 69
Inmarsat mini M GAN Inmarsat Fleet
Maritime or land mobile normal calls
The full Inmarsat BGAN numbering format, a dual T digit format, is as follows:
7 (t1), 7 (t2) are the two T- digits indicating that it is a BGAN call
NDC (National Destination Code) or leading digits of N(S)N (National (Significant) Number) Inmarsat T-digit(s)
Inmarsat BGAN/GSPS voice
Mobile voice calls
Inmarsat BGAN/GSPS ISDN
Mobile ISDN calls
Inmarsat is connected to most international telecoms carriers.
It is the responsibility of the telecoms carriers worldwide to ensure that they have arrangements in place to switch voice calls between the PSTN and the Inmarsat network.
To assist carriers in ensuring that their access is properly configured, two test numbers have been established within the BGAN network:
For BGAN voice: +870 77 210 9000
For BGAN ISDN and fax: +870 78 210 9000
To assist carriers in ensuring that their access is properly configured, a test number has been established within the GX network:
For Global Xpress voice + 870 23 199 9999
Each number provides access to a suitable voice announcement.
Inmarsat is a full member of the GSMA and supports roaming SMS connectivity.
Inmarsat can send SMS text to more than 1,000 telecommunications carriers globally.
Inmarsat has contracted SAP 365 as the SMS Hubbing partner and all SMS should flow through SAP.
It is the responsibility of the sending party carrier to send SMS to Inmarsat. More than 500 carriers can successfully send to Inmarsat.
An originating carrier should open the range +870 and deliver the SMS to SAP 365.
Inmarsat has contracted Comfone as the Roaming Hub partner and all roaming arrangements should be made with Comfone. Inmarsat uses Comfone for all clearing and signaling.
Inmarsat has meet-me points in Amsterdam (Telecity) , Sydney (HMSP/NTTICT) and New York (Hudson Street).
Customers can connect to any of these nodes in order to access the Inmarsat global backbone.
Inmarsat offers standard internet access, APN routeing and a large selection of IP value-added services.
As from 1 January 2014, Inmarsat is introducing a new voice over IP (VoIP) platform called Global Xpress (GX). Calls to these numbers should be at no more than a US $0.15 per minute retail fee, thus offering a reliable and inexpensive way to contact Inmarsat Global Xpress (GX) customers.
The full Inmarsat GX numbering format, a single T digit format, is as follows:
+870 t1, x1, x2, x3, x4, y1, y2, y3, y4 where,
2 (t1), is the T- digit indicating that it is a GX VoIP call
Inmarsat GX VoIP
IP voice calls
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