Method for transmitting a message and telecommunication system

A method for transmission of a message from a first to a second telecommunication terminal (CD) , of which at least one is connected to a line-connected telephone network (PSTN) with DTMF signaling, in which case,

• the SMS protocol architecture of the GSM standard or a comparable architecture of the UMTS standard is mapped onto the fixed network and expanded,
• the message is input as a short message, in particular via an input keypad or a touchscreen, on the first telecommunication terminal,
• the short message is converted into the short message format,
• a logical connection setup is realized by means of an adequately specified data link layer (DL), combined with a short message transfer layer (SM-TL) , a short message relay layer (SM-RL) and also a connection management layer (CM),
• the short message is transmitted in the short message format in an adequately specified physical layer by means of DTMF or FSK off-hook signaling to a short message service center (SMSC) and from the latter to the second telecommunication terminal, and
• the short message obtained from the short message service center is converted, in the second telecommunication terminal, into an output format and is output, in particular on a display unit.