What does an empty number mean?

An empty number refers to a number that cannot be connected temporarily, or the dialed number has not been registered by the telecom service provider.

A number originally used by others, but after changing the number, the original number may become an empty number or a new phone number of others. If the user enters an empty number when dialing, the service provider will have a voice prompt similar to "The number you dialed does not exist, please check it and dial again".

Space numbers are divided into intelligent network users and global users. When an intelligent network user is called, due to the signaling interaction process between MSC and SCP, SCP needs to analyze the user, and there is an SCP system error in the analysis process, resulting in the information returned to MSC that the user is down or does not exist.

Extended data

The MSGID conversion ANNC table of MSC and GW is incorrect, or the signaling feedback to MSC and GW is flashing or wrong, which may misjudge the called number as "the subscriber you dialed is power off", "the subscriber you dialed is power off" and "the number you dialed does not exist", while MSC plays notification tones such as "the subscriber you dialed is power off" and "the number you dialed does not exist" to the caller.

During the call, after the switch analyzes the data, called status and attributes, if the call is unsuccessful, it will generate EOS, and the switch will analyze EOS to generate ANNC, and then the notification tone will play the related audio track.

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