SMS PDU's (Packet Data Unit) are the encoded SMS messages that are sent over the GSM network. This function decodes the 7bit data in HEX representation back to a "readable" string. As SMS messages are transmitted 140 8-bit octets at a time, GSM-7 encoded SMS messages can carry up to 160 characters.īeside encoding the string as 7bit packed data in HEX representation, this method also adds the length in front of the encoded string, it's needed in some GSM protocols as a kind of checksum and to help with certain edge cases. GSM-7 is a character encoding standard which packs the most commonly used letters and symbols in many languages into 7 bits each for usage on GSM networks.
10 extra characters are defined in the GSM 7-bit default alphabet extension table and they have to be represented through an escape mechanism using the escape character (0x1B). The GSM 7-bit default alphabet consists of 128 characters totally and each character is represented by 7 bits. it does not accommodate the extended alphabet. Gsm7bit-decoder.js // This decoder is based on this answer // It's not perfect, e.g.
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