DECT vs Bluetooth: Which Wireless Calling Tech Is Right for You?
When you need to move around while on a call, DECT, a digital cordless phone technology designed specifically for voice calls. Also known as Digital Enhanced Cordless Telecommunications, it’s the backbone of most office cordless phones and home base stations. Bluetooth, a short-range wireless standard used for connecting devices like headsets, speakers, and phones. Also known as wireless audio pairing, it’s everywhere—but not always built for long calls. These two technologies sound similar, but they serve very different purposes in VoIP and phone systems.
DECT is made for calls. It uses a dedicated 1.9 GHz frequency, avoids Wi-Fi interference, and gives you up to 100 meters of range indoors—perfect for walking from your desk to the kitchen while on a client call. It supports multiple handsets on one base, has better call quality than Bluetooth, and rarely drops audio. Most business-grade cordless phones use DECT because it’s built for reliability, not just convenience. Bluetooth, on the other hand, runs on 2.4 GHz—the same band as Wi-Fi, microwaves, and smart home gadgets. That means interference is common. Range? Usually 10 meters max. It’s great for quick calls with a headset, but if you’re on a 30-minute Zoom meeting and your headset keeps glitching, you’re not alone.
DECT systems often plug directly into your VoIP router or ATA, turning your old analog phone into a wireless one without losing clarity. Bluetooth headsets need to pair with your phone or computer first, then route the call through that device—which adds latency and drains battery faster. If you’re using a VoIP desk phone with Bluetooth support, you’re likely just using it as a secondary headset, not your main calling tool. Real businesses? They use DECT for reception desks, warehouses, and remote teams who need to stay connected without wires. Bluetooth? It’s for coffee shop calls or quick check-ins.
Neither is better overall—but context matters. If you need a full-time, high-quality, multi-handset system for your office, DECT wins. If you just want to take calls while walking the dog or commuting, Bluetooth is fine. And yes, some newer VoIP phones now support both: DECT for primary use, Bluetooth for backup. But if you’re buying new equipment, don’t assume Bluetooth can replace DECT. They’re not interchangeable.
Below, you’ll find real-world guides on how these technologies fit into modern VoIP setups—from setting up DECT handsets with your SIP provider to troubleshooting Bluetooth audio lag on Zoom. Whether you’re running a home office or managing a small team, you’ll find practical fixes, hardware comparisons, and clear advice to cut the guesswork.
