ITU-T V.61-1996
用于公用电话交换网和点对点2线租用电话型电话上的,能同时传输语音和数据的调制解调器
Simultaneous Voice Plus Data Modem Operating at a Voice Plus Data Signalling Rate of 4800 Bit/s with Optional Automatic Switching to Data-Only Signalling Rates of up to 14 400 Bit/s for Use on the General Switched Telephone Network and on Leased Point-to-