Inmarsat Satellite Network Routing for Calls

Calls from the terrestrial telephone network (PSTN) to an Inmarsat network are made using the Inmarsat +870 international dialing code. Phone calls and data connections are routed by the international telecoms carriers based on the numbering formats described here.

Inmarsat Constellations

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

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 that they have arrangements in place to switch voice calls between the PSTN and the Inmarsat network.

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.

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 signaling.

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 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 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,

+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

in Services Tags: InmarsatServices