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P USBSD On Hold Music Player mp3 Music Message on Hold Player for all PBX KSU or key system telephones or any phone with audio input connector - Newegg.com
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Amazon.com: iHold A4LP 4-Line Music On Hold Player system for all corded or cordless 2 line or 4 line telephones, "All-In-One" Music On Hold adapter plus mp3 On-Hold Music Player : Electronics
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Amazon.com : iHold 2LP 2-Line Music On Hold device | Small Business Music On Hold for all PBX or regular 1 to 4 Line telephones | USB, mp3 | easy Setup. : Office Products
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