Según la ITU esta variable gráfica:
A main line is a (fixed) telephone line connecting the subscriber's terminal equipment to the public switched network and which has a dedicated port in the telephone exchange equipment. This term is synonymous with the term main station or Direct Exchange Line (DEL) that are commonly used in telecommunication documents. It may not be the same as an access line or a subscriber. The number of ISDN channels should be included. Fixed wireless subscribers should also be included. If not included, specify in a note
Que pasó entre 2006 y 2007?
Que año fue el tema de riesgo compartido con creo que Rieder?
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