every 15 second
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$IAL TONE
3PECIAL DIAL TONE
2INGING TONE
"USY TONE
#ONGESTION TONE
.UMBER UNOBTAINABLE
TONE
#ALL WAITING TONE
#ONFERENCE TONE
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)NTERNAL RINGING SIGNAL
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2ECALL SIGNAL
!UDIBLE SIGNALS 4ONE CHARACTERISTICS 2INGING SIGNALS
Summary of Contents for Dedicated Phone 3
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