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  2. Measure for natural disaster
  3. Disaster Emergency Message Dial (171)
  4. Outline


In the wake of a severe disaster such as an earthquake, the number of telephone calls increases dramatically as people phone to confirm the safety of loved ones, convey their sympathy, or make inquiries, resulting in difficulties in connection (telephone traffic jams), which can last for several days from the day of the disaster occurrence.

To mitigate such a situation, beginning on March 31, 1998, NTT East and NTT West have been providing a service called Disaster Emergency Message Dial (171) (telephone service), which is available only in the event of a natural disaster.

Disaster Emergency Message Dial (171) is a voice mail service that stores information on safety, etc., records and plays back messages using telephone numbers, mobile phone numbers, etc. such as for people in a disaster-stricken area as the key code to access the service.

Voice mail

A piece of mail (a letter, for example) bearing the destination (an address) and containing the information to be communicated (business or other matter) is mailed and delivered into the mailbox of the destination, with the information the sender wants to pass on being communicated to the addressee.

In the same way, a voice mail system records the information to be communicated (business or other matter) at the destination (in a “Mailbox”) by telephone. The addressee accesses this recording destination by telephone and plays back the information addressed to him/her, confirming this information.

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* Center usage charges regarding to the use of message storage units, etc. are free of charge. Dialing charges are free to record and play back messages from an NTT East or NTT West subscription phone. When you make calls from telephones connected to the network of a telecommunications carrier other than us, contact the relevant carrier regarding dialing charges.

Disaster Emergency Message Dial (171) is a service which stores messages at message storage units allocated on the NTT East and NTT West network and connects automatically for play back of messages.

Advantages of messages being relayed using NTT East and NTT West devices are:
  • the ability to communicate with those who have lost the means of answering telephone calls because they are evacuated away from home
  • the possibility of a disaster victim being contacted even if power interruption or disaster damage prevents use of his/her home phone;
in this way, the ease of conveyance of information on safety can be improved.

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