ABSTRAKSI: -Kata Kunci : -ABSTRACT: This time, Short Message Service feature has expanded to the Fixed Line PSTN network. Provider of fixed line telephone (PSTN), PT.Telkom has applying the Fixed SMS feature at some Divre II ( Jakarta ) and Divre V (Surabaya). SMSC PSTN ( Short Message Service Centre – PSTN ) is kind of server for SMS that connect to the PSTN central exchange. It can accept short message from SMTE ( Short Message Terminal Equipment ) PSTN, then deliver the message to the other SMTE destination nimber or also another terminal such as MS ( Mobile Station ). The srvice that offered of Telephone Fixed SMS user is can transfer short message To the other PSTN user or to seluler user. This final project focuses on data transfer in Fixed Phone network, including its protocol, configuration whitch support data transfer SMS and also the visualization of protocol system.Keyword: -