Guides, articles & reference for MCC products

• VoIP troubleshooting checklist — diagnose one-way audio, SIP registration failures, call drops, NAT issues, and choppy audio.
• Area codes and call routing — what an NPA controls in routing, and what breaks when a new code goes live.
• Wholesale voice termination: how the market works — A-Z rate decks, direct versus transit routing, and the four metrics that describe a route.
• VoIP routes explained — CLI, Non-CLI and CC route types, quality metrics, and how termination works step by step.
• USA CC routes — provisioning CPS and concurrency for dialer traffic, and what to test before committing volume.
• CLI vs NCLI routes — why caller ID delivery decides answer rate, and how to diagnose a route that stopped delivering it.
• UCaaS vs VoIP — the difference between the technology and the platform built on it, and which one a business needs.
• STIR/SHAKEN explained — caller ID authentication, attestation levels A/B/C, and how spam labeling decisions are made.
• SIP trunk pricing — per-channel vs per-minute pricing models, what affects cost, and what to ask a provider.
• What is SIP trunking? — how SIP connects your phone system to the PSTN, how channels work, and what to ask a provider.
• What is UCaaS? — cloud unified communications explained, how it works, and how it compares to a traditional PBX.
• What is CCaaS? — Contact Center as a Service explained: inbound queues, omnichannel, and the move from legacy hardware.
• UCaaS vs CCaaS — the difference between unified communications and contact center software.
• What is IVR? — how interactive voice response works, types of IVR systems, and common use cases.
• What is a predictive dialer? — how the pacing algorithm works and how predictive compares to power and preview dialers.
• VoIP for small business — why businesses switch from traditional lines, features that matter, and common mistakes to avoid.
• Contact center vs call center — channels, infrastructure, routing, and analytics differences explained.
• What is a softphone? — how VoIP softphones work over SIP and how they compare to desk phones.
• Call center metrics — the 12 KPIs every contact center manager should track, with formulas.
• Cloud PBX — how cloud PBX works, how it compares to on-premise, and how to migrate.
• What is 10DLC? — why US carriers require 10-digit long code registration and how brand and campaign registration works.
• How AI communication works — AI receptionists, voice agents, and chat agents: how they understand intent and hand off to humans.
• 213 area code — five splits, the 2017 recombination with 323, and the 738 overlay live since November 2024.
• US area code guides — where codes such as 202, 469, 480, 510 and 720 are used, which codes share an area, and how to dial them.

For articles grouped by topic, see the reading list.