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Inmarsat Update on BGAN fixed to mobile calls using the 3.1khz service


Dear BGAN Customers,

During August 2007 Inmarsat circulated the bulletin below detailing a plan to change the way that mobile terminated 3.1KHz data and fax calls are managed in the BGAN network. This email is to inform you that the update will take place on Wedneday 10th October at 10:00 UTC.
Inmarsat anticipates that the changes will result in an increase in successful termination of fax and data calls to BGAN numbers in the +870
78 xxx xxxx range.
Where success is not seen the cause, in the vast majority of cases, will be the choice of bearer circuits used before the call hits the BGAN
network, i.e the lack of success is not within Inmarsat's control. Where a fax or data transmission has been sent through bearer circuits where an inappropriate transmission medium is used (e.g. compression) calls will still terminate at the BGAN terminal but the data sent and received will not be decipherable.

The user experience will be as follows:

  • Device 1, for example a fax machine, will initiate a call to a BGAN terminal
  • The call will terminate and the BGAN will connect and answer
  • Device 1 then initiates a protocol handshake with the BGAN terminal but this action will fail due to the use of the inappropriate bearer circuit.
  • After a short period following the unsuccessful protocol handshake attempts the originating device will initiate a call clear action and the call will be disconnected.The call will be chargeable until such point it is cleared.

If a customer experiences the above when attempting a fax or data call they should be advised to contact their local PSTN service provider.


Dear BGAN users,

Since the beginning of the year there has been an increase in the number of reported BGAN fixed to mobile calls failing while using the 3.1khz service to send fax and data messages.
Investigation in to these failed calls has identified that the issue is caused by some terrestrial networks incorrectly tagging the call as “speech” instead of “3.1khz”. In this scenario the Inmarsat switch will block and terminate the call (because it is tagged incorrectly), and no charge is made to the calling party.  Terminating the call in this way ensures that the connection that is established to the BGAN terminal is optimised for data/fax communications.
Feedback from customers indicates that terminating this type of call is not beneficial and that Inmarsat should allow all call types to be passed. Operation would then be as the LESO’s method of allowing all call types to pass through to the Inmarsat BGAN service.
During September Inmarsat propose removing the blocking described above. This change may mean that a small number of calls will connect but will not be able to pass traffic because the configuration settings on some modems will not recognise these calls. However, because these calls have been connected (and therefore used satellite resource) they will be chargeable.

Sabre1 firmware version RO11.1.4


Dear BGAN Customers,

Wideye Sabre1 Firmware version R011.1.4 and Ethernet VSP driver version v1.4.0

We are pleased to inform you that the Sabre1 firmware version RO11.1.4 with Windows and MAC Upgrader and Ethernet VSP driver version v1.4.0 is now available for download from the Inmarsat website at You can also download this release through the BGAN LaunchPad Update feature from 1st October 2007. Please see attached briefing note for more information.

Inmarsat recommends that all customers install this release.

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