| 摘要 |
PROBLEM TO BE SOLVED: To realize an effective means to obtain an income for realizing a free charge phone service in a phone intercommunication. SOLUTION: A CM song is used in place of a phone call tone so as to provide pleasant music to users and advertisement opportunities to sponsors. Since the CM song is used for the call tone, users hear the CM song with much attention without fail so as to obtain a great advertisement effect. This advertisement income can provide a free charge phone service.
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