VoIP
Currentry people who are in train is typing mobilephone. I think it isn't "telephone", it is "telegraph". IP address depends on its network topology. DNS name space is free from real topology. Telephone number is currentry depends on telephone network. In case of we are thinking of telephone number mapping to IP address,we avoid to confuse this differnce. Does anyone type telephone number keys when calling?(You use telephone directory, right?)
Do we persist in "telephone number"?
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