How calls are routed through our network

The Inmarsat network is split into three satellite constellations.

  • Inmarsat-3 constellation – Existing and Evolved services
  • Inmarsat-4 constellation – BGAN/GSPS (2.5g and 3g network)
  • Inmarsat-5 constellation – Global Xpress (IP network)

The Inmarsat network supports voice phone calls, SMS text messaging, circuit-switched data, fax, Standard IP and Streaming IP.

Phone calls from the terrestrial PSTN

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.

For Existing and Evolved services

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)
Inmarsat T-digit(s)
N(S)N number length Usage of E.164 number Additional service information Description
30 – 37 9 digits 9 digits Inmarsat B Maritime mobile normal calls
38 9 digits 9 digits Inmarsat B Land mobile normal calls
39 9 digits 9 digits Inmarsat B Land and maritime high-speed data calls
50 – 57 9 digits 9 digits Inmarsat Aeronautical Primary addressing
58 9 digits 9 digits Inmarsat Aeronautical Alternate addressing
59 9 digits 9 digits Inmarsat Aeronautical Special facilities
60 9 digits 9 digits GAN Maritime mobile ISDN calls
61 – 67 9 digits 9 digits Inmarsat M Maritime mobile normal calls
68 – 69 9 digits 9 digits Inmarsat M Land mobile normal calls
76 9 digits 9 digits Inmarsat mini M GAN Inmarsat Fleet Maritime or land mobile normal calls

For BGAN and GSPS connections

The full Inmarsat BGAN 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

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) N(S)N number length Usage of E.164 number Additional service information Description
77 9 digits 9 digits Inmarsat BGAN/GSPS voice Mobile voice calls
78 9 digits 9 digits Inmarsat BGAN/GSPS ISDN Mobile ISDN calls

For the Global Xpress platform

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 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,

+870 is the country code

2 (t1), is the T- digit indicating that it is a GX VoIP call

NDC (National Destination Code) or leading digits of N(S)N (National (Significant) Number)
Inmarsat T-digit(s)
N(S)N number length Usage of E.164 number Additional service information Description
2 9 digits 9 digits Inmarsat GX VoIP IP voice calls

Interconnect operators – the international telecoms carriers

Inmarsat is connected to most international telecoms carriers.

It is the responsibility of the telecoms carriers worldwide to ensure they have put in place arrangements to switch voice calls between the PSTN and the Inmarsat network.

Further information can be obtained on Inmarsat’s numbering scheme on the ITU website.

Visit the ITU website: www.itu.int/ITU-T/inr/nnp/index.html

Voice and ISDN testing for carriers

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.

Short Message Service (SMS) text messaging

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.

SAP 365: http://www.sap.com/product/technology-platform/sms.html

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.

Roaming – MNC 901 MCC 11

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 signalling.

Comfone website: http://www.comfone.com

Meet-me points for Inmarsat’s IP data network

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.

For all queries relating to interconnection, roaming and SMS, please contact:

Daniel Notcutt
Inmarsat Interconnect Manager
Email: daniel.notcutt@inmarsat.com
Tel: +44 (0)207 728 1237.

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