Ringback tone

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21	PDF Document Add to Reading List Source URL: www.itu.int Language: English - Date: 2003-06-11 12:00:40 Signal tone Off-hook tone RBU Special information tones Frequency modulation Ringtone Call-progress tone Reorder tone Dial tone Ringback tone
22	PDF Document Add to Reading List Source URL: mmaglobal.com Language: English - Date: 2012-03-14 21:53:03 Telecommunications Mobile telecommunications Mobile content Marketing Advertising Ringback Tone Advertising Mobile marketing Mobile advertising PrivatePhone Technology Telephony Electronic engineering