SUBSCRIBER-BASED COMMON RING BACK TONE SYSTEM USING INTELLIGENT NETWORK AND METHOD THEREFOR, CAPABLE OF PROVIDING RING BACK TONE SERVICE WITHOUT CHANGING SOFTWARE OF EXISTING EXCHANGE
KIM, GYEONG SEON, LEE, JU YEOP, KIM, DAE SEONG, KIM, YONG HUN, JANG, JUNG HO
Year of Publication 16.11.2004
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Year of Publication 16.11.2004
Patent