Carrier insights.
Telecom expertise from the operator side. Written by the people who hold the FCC license and sign the calls.
Number Porting: Move Numbers to a New Carrier
Phone number porting explained step by step. The LNP process, LOA requirements, timelines, common delays, and how to port to SIPNEX without service interruption.
How VoIP Works: The 5-Minute Technical Explainer
How VoIP works from microphone to speaker. Voice digitization, packet transmission, codec encoding, SIP signaling, and RTP media flow in plain language.
VoIP Glossary: 60 Terms Explained
60 VoIP and telecom terms defined in plain language. From A2P to WebRTC, the complete reference for operators, buyers, and anyone evaluating voice services.
What Is Elastic SIP Trunking?
Elastic SIP trunking explained. What it is, how it differs from standard SIP trunking, who coined the term, and why SIPNEX's unlimited channel model may be better.
SIP Trunk Setup: VICIdial, Asterisk & FreePBX
SIP trunk configuration walkthrough for the three most common open-source platforms. Credentials, codecs, NAT, DTMF, and troubleshooting for each system.
What Is a PBX? Should You Run One in 2026?
PBX phone systems explained for modern businesses. What they do, on-premise vs cloud, Asterisk vs commercial, and when you need one vs hosted alternatives.
What Is SIP Protocol? A Plain-English Guide
SIP protocol explained without the jargon. What it does, how it works in plain English, why it matters for your phone system, and how it connects to STIR/SHAKEN.
RTP Protocol: How Voice Travels Over IP
RTP (Real-time Transport Protocol) explained for VoIP operators. How voice packets travel, codec payloads, jitter buffers, and why RTP problems cause bad audio.
G.711 vs G.729: Choosing the Right Codec
G.711 vs G.729 codecs compared for VoIP and call center use. Audio quality, bandwidth, AMD accuracy, and when each codec is the right choice.
ASR vs ACD vs AHT: Telecom Acronyms Decoded
Call center and telecom acronyms explained for operators. ASR, ACD, AHT, PDD, CPS, MOS, and every other acronym you need to know to run a dialer operation.
Vanity Phone Numbers: Worth It in 2026?
Vanity phone numbers explained. How they work, how to search for availability, acquisition costs, marketing value, and whether they're worth it for your business.
VoIP Quality: Jitter, Latency & MOS Explained
VoIP call quality explained for operators. Jitter, latency, packet loss, MOS scores, codec impact, and how to diagnose and fix audio quality problems.
Why Reseller VoIP Can't Give A-Level Attestation
The structural reason reseller VoIP providers deliver B-level STIR/SHAKEN attestation and how switching to a direct carrier fixes your answer rate.
Bandwidth vs Telnyx vs SIPNEX Compared
Three SIP carriers compared for call center operations. Bandwidth, Telnyx, and SIPNEX evaluated on pricing, attestation, channels, support, and fit.
Telnyx vs SIPNEX: Carrier Comparison
Telnyx vs SIPNEX compared for call center and dialer operations. Network ownership, attestation, pricing, support, and which fits which operation.
Abandoned Call Rate: FCC 3% Rule Explained
The FCC's 3% abandoned call rate rule explained for predictive dialer operators. How it's measured, what triggers violations, and how to configure your dialer to stay compliant.
VICIdial SIP Trunk Setup: Complete Guide
Step-by-step VICIdial SIP trunk configuration for SIPNEX. sip.conf settings, codec recommendations, DTMF, NAT traversal, and troubleshooting common issues.
How to Choose a VoIP Carrier for Dialers
The carrier evaluation checklist for predictive dialer operators. Channels, attestation, PDD, codecs, pricing, and the questions to ask before signing.
Predictive vs Progressive vs Preview Dialer
The three dialer modes compared for call center operators. When to use predictive, progressive, or preview dialing based on campaign type, compliance, and conversion goals.
SMS API Explained: What It Is & Who Needs One
SMS APIs explained for business operators. What they do, how they work, when you need one vs simple messaging, and how to evaluate SMS API providers.
Best SIP Trunk Providers 2026: Honest Review
SIP trunk providers compared by an operator who became a carrier. Bandwidth, Telnyx, Twilio, Flowroute, and SIPNEX evaluated on what actually matters for dialer operations.
How to Get a Toll-Free Number
How to get a toll-free number for your business. The provisioning process, RespOrg system, number selection, porting, costs, and setup timeline.
Auto Dialer Laws 2026: TCPA & State Rules
Auto dialer laws explained for call center operators. ATDS definitions, the Duguid decision impact, state variations, FCC enforcement, and practical compliance.
How STIR/SHAKEN Works: Technical Deep Dive
STIR/SHAKEN explained at the technical level. Certificate chains, SIP Identity headers, JWT tokens, attestation signing, and what operators need to understand.
VoIP Security: Threats and Carrier Protections
VoIP security explained by an FCC-licensed carrier. Toll fraud, eavesdropping, DDoS, TLS, SRTP, and the security measures that protect your SIP trunks.
SIP Trunk Pricing: What to Pay in 2026
SIP trunk pricing demystified. Per-minute rates, per-channel fees, DID costs, billing increments, and why most providers hide their rates behind a sales call.
Toll-Free vs Local Number for Business
Toll-free vs local phone numbers compared for business use. Cost, answer rates, trust signals, use cases, and when each type makes sense.
VoIP vs Landline: Why the Switch Is Inevitable
VoIP vs landline compared honestly. Cost, quality, features, reliability, and why the copper network is being decommissioned whether you switch or not.
Hosted PBX vs SIP Trunking: Which Is Right?
Hosted PBX vs SIP trunking explained by a carrier. When to let someone else run your phone system vs when to run your own with a direct trunk.
Twilio vs SIPNEX: Honest Carrier Comparison
Twilio vs SIPNEX compared for call center and dialer operations. Pricing, attestation, concurrent channels, support, and which carrier fits which operation.
Call Recording Laws by State
Call recording laws for every US state in 2026. One-party vs two-party consent, penalties, interstate conflicts, and implementation guidance for VICIdial operators.
Call Center Metrics That Actually Matter
The call center metrics that predict revenue and compliance risk. ASR, AHT, abandon rate, answer rate, occupancy, and what your carrier data reveals.
SIP vs VoIP: What's the Difference?
SIP vs VoIP explained by an FCC-licensed carrier. Why SIP is a protocol within VoIP, how they relate, and what operators actually need to know.
FCC Robocall Mitigation Database Explained
The FCC Robocall Mitigation Database explained. What carriers must file, what happens to non-filers, and why your carrier's RMD status affects your calls.
How Many SIP Trunks Do I Need? Sizing Guide
SIP trunk sizing explained by an FCC-licensed carrier. Concurrent channels, bandwidth math, VICIdial capacity planning, and why the question itself is outdated.
Call Center Compliance: Federal & State Rules
Call center compliance explained for dialer operators. TCPA, TSR, state telemarketing laws, STIR/SHAKEN, DNC, and the carrier infrastructure that supports it.
A-Level vs B-Level STIR/SHAKEN Attestation
The difference between A-level and B-level STIR/SHAKEN attestation, why it matters for answer rates, and why only direct carriers can reliably deliver A-level.
A2P 10DLC Registration: Step-by-Step 2026
A2P 10DLC registration explained step by step. Brand vetting, campaign registration, throughput tiers, carrier surcharges, and what happens if you skip it.
SIP Trunking vs PRI: Why T1 Lines Are Dead
SIP trunking vs PRI compared by an FCC-licensed carrier. Channel capacity, costs, features, and why every major carrier is sunsetting ISDN PRI lines.
E.164 Format: International Phone Numbers
E.164 phone number format explained for VoIP operators. What it is, why SIP trunks require it, formatting rules, and common mistakes that break call routing.
Caller ID Reputation: Why Numbers Get Flagged
Your answer rate dropped and you don't know why. It's probably caller ID reputation. Here's how the flagging system works and what operators can do about it.
VoIP for Business: The 2026 Buyer's Guide
An honest VoIP buyer's guide from an FCC-licensed carrier. What to look for, what to avoid, real costs, and why most comparison sites are paid advertisements.
Two-Party Consent States for Call Recording
Every two-party and one-party consent state for call recording in 2026. The laws, the penalties, and what dialer operators need to build into their workflows.
SMS vs MMS: Complete Business Comparison
SMS vs MMS explained for business messaging. Character limits, media support, A2P 10DLC requirements, carrier policies, and which to use for your campaigns.
What Is a DID Number? Operator's Guide
DID numbers explained by an FCC-licensed carrier. What DIDs are, how they work, provisioning, porting, and why your DID strategy affects your answer rate.
What Is a Predictive Dialer? Operator's Guide
Predictive dialers explained by the carrier operators trust. How they work, carrier requirements, and why your SIP trunk choice matters more than the dialer software.
CNAM Lookup Explained: What It Is & How It Works
CNAM (Caller ID Name) lookup explained by an FCC-licensed carrier. How CNAM databases work, why your caller ID shows the wrong name, and how to fix it.
TCPA Compliance Checklist for 2026
The TCPA compliance checklist that actually helps dialer operators. Covers consent, ATDS rules, DNC, calling hours, and what changed in 2025-2026.
Caller ID Spoofing: How It Works & Why Illegal
Caller ID spoofing explained from the carrier side. How spoofing happens technically, the Truth in Caller ID Act, and STIR/SHAKEN's role in stopping it.
What Is SIP Trunking? The Complete Guide for 2026
SIP trunking explained by an FCC-licensed carrier. What it is, how it works, what it costs, and why it replaced PRI lines for voice, messaging, and call center operations.