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auのVoLTE対応のiPhoneではVoLTEと3G回線とで音声通話の切り替えを行うと留守番電話サービスに転送されなくなります | くま同盟コンピュータLab

auのVoLTE対応のiPhoneではVoLTEと3G回線とで音声通話の切り替えを行うと留守番電話サービスに転送されなくなります

2015年9月13日

【au版】 iPhone6 64GB シルバー MG4H2J/A 白ロム
auのLTE対応のiPhoneで留守番電話サービスを利用するには通話オプションサービス 「お留守番サービスEX」に加入する必要があります。

https://kumadoumei.net/2014/08/aulteiphone-iphone-5iphone-5siphone-5c/

http://www.au.kddi.com/iphone/support/guide/visual-voice-mail/

IMG_2284
しかしある時、「お留守番サービスEX」に加入しているにもかかわらず、留守番電話サービスに転送されないことに気付きました。

恐らく、iOS 8.3へのアップデート及びVoLTEに対応してからのような気がします。
何らかのタイミングで留守番電話サービスへの転送が止まってしまったようです。

au VoLTEと3G回線とで音声通話の回線の切り替えを行うと留守番電話の設定がリセットされるので、その都度留守番電話の設定を行う必要があります。
↑かなり重要な事項ですが、auのWebサイトにはそれほど目立つように記載してありません。また、au ショップのスタッフの方も知らない人が多いです。

留守番電話サービスへの転送を再開するには

IMG_1912
4G回線が「データ通信」のみ、及び4G回線が「オフ」の場合、iPhoneから「1411」へ電話をかけると留守番電話サービスが再開されます。

IMG_1913
4G回線が「音声通話およびデータ」の場合、VoLTEになるので、iPhoneから「14122」へ電話をかけると「設定を承りました」とガイダンスが流れ、留守番電話サービスが再開されます。

まとめ

音声通話をVoLTEと3Gとで切り替えると留守番電話の設定がリセットされます。

  • 3G回線=「1411」
  • 4G回線(VoLTE)=「14122」

へ電話をかけて再度留守番電話サービスを再開させます。

参考:

http://csqa.kddi.com/posts/view/qid/k1532431799/

http://www.au.kddi.com/mobile/service/call/orusuban-ex/

「お留守番サービスEX」に加入しているのに最近、留守番電話にメッセージが入っていないなぁと思う方は一度確認してみては如何でしょう?

2015年9月13日追記

どのタイミングで留守番電話サービスへの転送がされなくなるのか判明したため、記事を改訂しました。