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• ↓ Technology Advice for Small Businesses powered by Pronto Marketing
• ↓ FXS vs. FXO ports: What they are and why the difference matters for VoIP
• ↓ What’s the difference between FXS and FXO? A plain-language guide for businesses
• ↓ FXS and FXO explained: The analog telephony basics every VoIP setup depends on
• ↓ Stop scrolling through filters: How Excel slicers make data exploration simple
• ↓ Excel slicers: The visual filtering tool most users don’t know about
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"If you’re setting up or expanding a VoIP phone system, you’re likely to encounter the terms FXS and FXO. They refer to two types of analog telephony interface ports, and understanding the difference between them is more than a technical detail. The relationship between FXS and FXO ports determines how your phones connect to your network, how calls are initiated and received, and how analog infrastructure integrates with modern VoIP systems."

"FXS stands for Foreign Exchange Subscriber. An FXS port is the interface that delivers phone service to an end device, such as a telephone, fax machine, or modem. The FXS port provides the physical connection point on a router, PBX, or access server, supplying the electrical current, dial tone, and ring signal that an analog device needs to function. Think of it as the port in the wall: the source of the phone service itself."

"On the other hand, FXO stands for Foreign Exchange Office. An FXO port is the interface on the end device — the phone or fax machine — that plugs into the FXS port. The FXO port receives a dial tone. It connects the device to the telephone network and signals to the FXS port that it wants to initiate a call when the handset is lifted or otherwise activated."

"FXS and FXO ports are designed to connect only to each other. An FXS port always connects to an FXO port, and vice versa. The pairing is what makes a phone call possible."

Key Topics & Focus Areas for techadvisory.org:

Technology Advice for Small Businesses powered by Pronto Marketing

FXS vs. FXO ports: What they are and why the difference matters for VoIP

What’s the difference between FXS and FXO? A plain-language guide for businesses

FXS and FXO explained: The analog telephony basics every VoIP setup depends on

Stop scrolling through filters: How Excel slicers make data exploration simple

Excel slicers: The visual filtering tool most users don’t know about