Server Library


Glossary of selected terms used throughout the documentation.

ASCII American Standard Code for Information Interchange. Widely adopted system of encoding alphanumeric characters for telecommunication and computer use. It comprises 128 graphics characters and control characters with codes between 0 and 127. Extended version of the standard comprises 256 characters between 0 and 255.
CIMD Computer Interface to Message Distribution. Protocol for sending and receiving text messages through SMSC of the GSM network operator. Protocol developed by NOKIA.
Direct Display Mode of sending messages, where a received message is treated as a message for immediate display on terminal (telephone) screen. Often referred to as FlashSMS.
EMS Enhanced Messaging Service. Standard laid down to allow sending enriched content of short text messages. It is based on the standard SMS messages. Using EMS messages one can send messages containing logos, images, ring tones, formatted text and special effects. If GSM terminal cannot display a content of the message using the transferred information about formatting and attachments - unformatted message text will be displayed.
GSM Alphabet The way of encoding characters sent in short text messages. The alphabet encodes a single character on seven bits allowing transmission of up to 160 characters in 140 bytes of data that is available in SMS message. The full definition of the encoding is contained in [03.38].
Hexadecimal Encoding Encoding of data using base 16 numeric system. Each character of the string contains digits 0-9 or A-F letters (upper-case or lower-case) that signify respective hexadecimal code characters. Every two hexadecimal characters describe one byte of data.
MMS Multimedia Messaging Services. Extension of SMS and EMS standards. Enables sending messages that contain, apart from possibilities of both mentioned standards, also the possibility to attach video fragments and sound.
Roaming Service, which enables the Subscribers to use GSM telephony services using networks of other operators usually abroad of the country where the telephone is originally registered.
SEMA OIS Sema Open Interface Specification. Protocol for sending and receiving text messages through the SMSCs of GSM network operator. Protocol developed by Sema group.
GSM Short Numbers Stake of special numbers within the numbering plan of the GSM network. Numbers are used to realize supplementary services of different kind. Typically they are four digits numbers accessible exclusively within one network (there is no possibility to send messages nor to make a connection with the number belonging to another network).
PDU Protocol Data Unit. That is all the bytes which are transferred via lower level protocols.
SMPP Short Message Peer to Peer Protocol. Protocol for sending and receiving text messages through the SMSCs of GSM network operator. Used particularly in corporate installations and when high efficiency is demanded. Protocol developed by the SMPP Developers Forum group.
SMS Short Message Service. Standard of transmission of messages containing up to 160 characters, 140 data bytes or 70 characters encoded in the Unicode standard between GSM terminals.
SMSC Short Message Service Centre. An element of the telecommunication infrastructure of GSM system responsible for delivery of SMS messages.
UCP Universal Control Protocol. Protocol for sending and receiving text messages through the SMSCs of GSM network operator, ISDN network, modem connection etc.
UDH User Data Header. SMS message may contain a user defined header, which includes additional directions as to how to treat the content. An example of a message containing UDH are concatenated messages, EMS messages, messages including graphics characters, images, ring tones, formatted text and special effects.
Unicode Multibyte standard of encoding string characters developed by the Xerox and Apple company. Contains all national characters. It comprises 65536 different characters. First 256 characters are identical to the extended ASCII standard.
UTC Universal Time Coordinated. Universal time standard, one of several successors to Greenwich Mean Time (GMT).