说明：  西门子tc35i AT指令集的详细说明文档。包括Standard V.25ter AT Commands、传真指令、GSM07.07指令集、以及西门子增强AT指令集说明。
(Siemens tc35i AT instruction set detailed description of the document. Including Standard V.25ter AT Commands, fax orders, GSM07.07 instruction set, as well as Siemens, AT enhanced instruction set description.)