REVENUE RECOGNITION (Details) - Nature of Services	12 Months Ended
	Dec. 31, 2019
Voice Services [Member]
REVENUE RECOGNITION (Details) - Nature of Services [Line Items]
Revenue Recognition Period	1 month
Video [Member]
REVENUE RECOGNITION (Details) - Nature of Services [Line Items]
Revenue Recognition Period	1 month
Data [Member]
REVENUE RECOGNITION (Details) - Nature of Services [Line Items]
Revenue Recognition Period	1 month
Other Contracted Revenue [Member] | Minimum [Member]
REVENUE RECOGNITION (Details) - Nature of Services [Line Items]
Revenue Recognition Period	3 years
Other Contracted Revenue [Member] | Maximum [Member]
REVENUE RECOGNITION (Details) - Nature of Services [Line Items]
Revenue Recognition Period	10 years
Product and Service, Other [Member]
REVENUE RECOGNITION (Details) - Nature of Services [Line Items]
Revenue Recognition Period	1 month