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<br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> <br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> <br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> IP電話とは /home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php on line 137

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IP電話(Internet Protocol 電話)IP電話とは、電話網の一部をインターネット経由に置き換えた電話サービスのことです。">
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class="wp-singular post-template-default single single-post postid-295 single-format-standard wp-theme-quadra_biz001 use_header_fix use_mobile_header_fix aa-prefix-taiku-">

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用語解説


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第27回:IP電話(アイピー電話)


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IP電話(Internet Protocol 電話)

IP電話とは、電話網の一部をインターネット経由に置き換えた電話サービスのことです。途中の回線をインターネット経由にすることで、従来の「距離と時間に応じた従量課金制」を採る必要がなく、多くの事業者が「距離に依らず一定な安い電話料金」を売りにサービスを提供しています。

IP電話のIPとは 「Internet Protocol」の略で、そのものズバリ「Internet Protocolを利用した電話サービス」という意味を示します。初期の頃は事業者毎に独特な規格を用いるケースがほとんどで、あくまでも閉じた範囲内の通話サービスに限られていました。しかし現在では、VolP (Voice over IP) というIPネットワーク上で音声通話を実現する技術に対してH.323という標準規格が定められ、各社がVoIP用の機材として開発するルーターや交換機に関してもこの規格に準ずるようになりました。そのため相互の接続制が向上することとなり、通信事業者のみでなくISP (Internet ServiceProvider) のサービスメニューにも名を連ねるほど、広く一般に普及するようになっています。

ただしIP電話という言葉を、上記のような通信事業者の提供する「VolP技術を利用した電話サービス」に限るのは狭義の場合であり、「インターネットを介した音声通話全般」をIP電話と呼ぶことも珍しくありません。その場合は、SNSやチャット用アプリケーションを介した音声通話なども、この枠内に入ることとなります。

関連用語

>>戻る【第26回:WiMAX(ワイマックス)】

>>続く【第28回:NIC(ニック)】


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第27回:IP電話(アイピー電話)


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TOP

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