Business Phones, Explained Like You're Busy
Forty guides to the terms, laws, and plumbing behind business phone systems: what each thing means, why it matters, and the honest version of when it doesn't.
Fundamentals
What is VoIP?
Internet phone service in plain English: how it works and what you need.
VoIP vs landline
An honest comparison: cost structures, failure modes, and where copper still wins.
What is a hosted PBX?
The phone system's brain, moved out of your closet. Cloud vs on-premise, honestly.
What is UCaaS?
The umbrella term for calling, messaging, and meetings as one cloud service.
What is SIP trunking?
Virtual phone lines for legacy equipment, and when you can skip the concept.
Extensions vs lines vs numbers
Three concepts wearing the same vocabulary. Untangle them and pricing makes sense.
What is a softphone?
Your business line as an app, and when a desk phone still earns its space.
The copper retirement
Carriers are decommissioning the landline network, on purpose. What that means.
Numbers & Caller ID
What is a DID number?
The difference between a number and an extension, and why it shapes how you answer.
How toll-free numbers work
The 8xx system, RespOrgs, vanity numbers, and what toll-free still buys.
Choosing a business number
Local, toll-free, or vanity: the number is marketing before anyone answers.
Caller ID and CNAM
The number and the name travel separately, which explains everything that goes wrong.
How number porting works
Keeping your number when you switch: process, paperwork, and real downtime.
Someone is spoofing my number
Strangers calling back angry about calls you never made. The honest playbook.
What is STIR/SHAKEN?
The authentication system behind 'Spam Likely' labels, and how to stay off the list.
Features, Explained
Auto attendant vs IVR
The difference, plus menu-design rules that keep callers from hating you.
Ring groups vs hunt groups vs queues
Three ways one number rings many people, and when each fits.
Forwarding and find-me/follow-me
From 'send it to my cell' to rules that know it's Tuesday and you're in court.
Voicemail-to-email and transcription
Voicemail stopped being a place you call and became a message you read.
Conference calling and bridges
Three-way calls, standing bridges, and why the dial-in number refuses to die.
SMS vs MMS
160 characters of reliability vs pictures. The distinction still shapes cost.
A2P vs P2P messaging
Carriers sort every text into human or application traffic. The sorting decides delivery.
What is 10DLC?
Why business texting requires registration now, and what happens without it.
Legal & Compliance
Call recording consent laws
One-party vs all-party states, the interstate problem, and the one-sentence fix.
TCPA basics
The federal law behind the class actions, for businesses that call and text.
The Do Not Call registry
What it prohibits, the exceptions, and the internal list that matters more.
E911: Kari's Law & RAY BAUM'S Act
What federal law requires when someone dials 911 from your phones.
Technical & Troubleshooting
VoIP call quality
Latency, jitter, and packet loss: the numbers that matter and fixes that work.
Bandwidth for VoIP
About 100 kbps per call. The real math, and why gigabit offices still get choppy calls.
Codecs and HD voice
Why some calls sound like the person is in the room and others sound like 1985.
One-way audio
The NAT problem behind 'can you hear me?', and the fix order, starting with SIP ALG.
PoE: how desk phones get power
One cable for data and power, and the UPS trick that survives outages.
VoIP security
Toll fraud, credential theft, and vishing: the real threats, ranked, with defenses.
Wi-Fi calling vs VoIP apps
Both call over the internet from the same phone. The identity is the whole difference.
Faxing over the internet
Why fax struggles on packet networks, what T.38 fixes, and the case for cloud fax.
What is an ATA?
The box that keeps fax machines, door buzzers, and paging amps alive.
Alarm and elevator lines after copper
Life-safety devices need more than 'it seems to work.' The careful migration.
Continuity: phones in an outage
Four disasters break phones four ways. Five settings decide if callers notice.
Buying & Switching
Switching providers, safely
The vendor-neutral checklist that steps around every classic switching disaster.
The full glossary
Nearly 50 terms defined in a sentence or two, A to Z, with links to the deep guides.
Prefer the practical guides? Head to the blog, or see how phone systems map to your industry.