While there isn't a single device officially named the "Phone Switch 300," this phrase most likely refers to the Earsonics SWITCH 300 PRO in-ear monitors or the Cisco 300 Series network switches often used for IP phones.
: They include a web-based management interface that is much simpler to navigate than high-end enterprise gear. Motorola Moto G Power 5G is currently a top-rated choice in that price bracket. Best Phones Under $300 in 2026 - CNET phone switch 300
Early firmware versions of the Phone Switch 300 had a notorious bug: the FXS ports would create a "loop current" that fried cheap analog phone speakers. This was fixed in firmware version 2.1.4.8 . Always check your firmware on arrival. While there isn't a single device officially named