VoIP vs. TDM voice
Time-division multiplexing (TDM) isn't dead yet as the backbone of corporate phone networks, but it is definitely in its last throes.
TDM, phone technology based on circuits switched by venerable PBXs, provided valuable services for a long time. Everybody got their own extension, a fancy corporate phone, voice mail, and sometimes extra features such as conferencing, multiple call appearances and caller ID.
It was reliably maintained by well-trained telecom staffers who knew their switches like the backs of their hands.
When voice-over-IP(VoIP) came along, promising to run voice calls over IP networks for less money, customers were intrigued. Rather than send out a technician to move a phone extension from one office to another, the user just had to move his phone to a new jack and it would receive calls meant for the person it was assigned to, no technician required.
Read the whole article here.
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