| 摘要 |
When a call from a subscriber telephone set 81 is received via a telephone switch 74 and a metallic subscriber line 72 in a subscriber terminal 51, an xDSL home unit 60 generates an electronic mail indicative of the call reception with a metallic subscriber line 72 used as an xDSL line 72 for feeding the electronic mail thus generated via the xDSL line 72, an xDSL station side unit 104 and an internet NW to an internet provider 105 and thence transmitting the mail via an internet NW to a portable telephone radio base station 106 and also to a portable telephone set 107. When a reception request is provided from the portable telephone set 107, the xDSL home unit 60 feeds the call from the subscriber telephone set 81 via the xDSL line 72, an xDSL station side unit 104, the internet NW to the internet provider 105 for transmission of the call via the internet NW to a portable telephone radio base station 106 and also to the portable telephone set 107.
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