From Legacy PBX to Elastic SIP Trunking: The Evolution of Cloud Telephony
For decades, the sound of the office was the ringing of a desk phone, a sound orchestrated by a mysterious, refrigerator-sized box humming away in a server closet. This was the world of the Private Branch Exchange, or PBX, a world of physical hardware, rigid capacity, and complex maintenance. It was a reliable workhorse, but
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