When it wishes to send a Message, so an Alert or Response or GBT Message, a GSME shall send a TransferData command to the CHF with the value in the Data parameter payload of the TransferData command set to the concatenation:
0x03 || Message
When it wishes to retrieve a Message stored for it on a CHF, a GSME shall send a TransferData command to the CHF with the value in the Data field set to 0x01. When the CHF receives such a TransferData command from a GSME, the CHF shall send a TransferData command to the GSME with the value in the Data parameter payload set to:
0x02 || (Number of Messages remaining for retrieval after this Message) || (Message addressed to the GSME)
where it has Messages for the GSME not yet downloaded by the GSME; or
the concatenation 0x02 || 0x00, where it has no Messages for the GSME to retrieve, the 0x00 representing the number of Messages available to retrieve.
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