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Iridium Satellite LLC
Short Burst Data Developers Guide V2.01
5.4.5 MT DirectIP Header
The information in this header is required as part of every DirectIP MT message delivery.
5.4.5.1 MT Header Length
This field specifies the number of bytes in the IE following this byte. Even though the length is fixed, the field
is included as a standard across all IEs and to allow for maximum flexibility for future enhancements.
Field Name Data Type
Table 5-13 MT Header IE
Length
(bytes)
43
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Range of Values
MT Header IEI char 1 See Table 5-7
MT Header Length unsigned short 2 21
Unique Client Message ID char 4 From client (not MTMSN)
IMEI (User ID) char 15 ASCII Numeric Characters
MT Disposition Flags unsigned short 2
5.4.5.2 Unique Client Message ID
Bit Map: See Table 5-14 MT Disposition
Flags
The vendor client will include a 4-byte message ID unique within its own application. This value is not used
in any way by the GSS server except to include it in the confirmation message sent back to the client. This is
intended to serve as a form of validation and reference for the client application. The data type is specified
to be characters. However, from the client’s perspective, the four bytes may be a character string, an
integer, etc.
5.4.5.3 IMEI
The IMEI is the equipment identifier, unique to each Iridium field device, of the MT message destination
IMEI. It is a 15-digit number represented here in ASCII format.
5.4.5.4 MT Disposition Flags
These flags are set by the vendor client to trigger particular actions by the GSS. Combinations of flags are
allowed. The field is a 2-byte bit map with 16 available flags. Those defined are shown in Table 5-14.
Table 5-14 MT Disposition Flags
Disposition Flag Value Description
Flush MT Queue 0x0001 Delete al MT payloads in the IMEI’s MT queue
Send Ring Alert –Mo MTM 0x0002
Send ring alert with no associated MT payload
(normal ring alert rules apply)
5.4.6 MT Payload
This information element includes the actual MT payload to be queued and delivered over the air to the
destination IMEI. This inclusion of this IE in the MT delivery is optional based on the disposition flags
included in the header.