Learn
Guides for teams that run voice traffic
Written by the engineers and compliance staff who route our traffic. Each guide is reviewed against current regulation and updated when the rules change.
01
Fundamentals
How CLI routes work and how to read the numbers that describe them.
- What Is a CLI Route? A Practical Guide for Voice BuyersWhat a CLI route is, how caller ID travels across carriers, why it gets lost, and how to tell a genuine CLI route from a non-CLI one before sending traffic.Mara Lindqvist8 min
- ASR, ACD, PDD and NER: Voice Quality Metrics ExplainedHow ASR, ACD, PDD and NER are calculated, what healthy values look like by traffic type, and how to read the four together to diagnose a route.Mara Lindqvist7 min
- Short-Duration Traffic and CC Routes: What Dialer Operators Need to KnowWhy carriers treat short-duration dialer traffic differently, how CC routes are built to carry it, and how to keep your short-call ratio healthy.Tomás Herrera7 min
02
Compliance
Caller-ID, consent and attestation rules that decide whether calls connect.
- IVR & Press-1 Routes Explained: Lawful Voice Campaigns at ScaleHow IVR and press-1 routes work, which campaigns they suit, and the consent, TCPA and DNC rules that keep automated voice campaigns lawful and routes stable.Priya Natarajan7 min
- STIR/SHAKEN for Call Centers Outside the USHow STIR/SHAKEN affects offshore call centers calling the US and Canada: attestation levels, gateway provider rules and the Robocall Mitigation Database.Priya Natarajan7 min
- CLI Rules by Country: Caller-ID Presentation Around the WorldCaller-ID presentation rules country by country: who regulates CLI, which numbers you may present, and detailed route pages for 20 key markets.Priya Natarajan9 min
03
Engineering
Configuration, capacity and troubleshooting for SIP and dialer platforms.
- False Answer Supervision (FAS): How to Detect and Stop ItWhat false answer supervision is, how it inflates ASR and bills, the CDR patterns that reveal it, and the test-call method we use to prove it on a destination.Mara Lindqvist7 min
- SIP Channels & CPS Sizing for DialersHow to size concurrent SIP channels, calls per second and bandwidth for predictive and IVR dialers, with worked examples, codec tables and safe headroom rules.Tomás Herrera7 min
- VICIdial Carrier Setup: Connecting a SIP Trunk Step by StepStep-by-step VICIdial carrier setup: IP auth or registration, account and dialplan entries, dial prefix, caller ID, codecs and checks to run before going live.Tomás Herrera7 min
- SIP Response Codes for Dialer OperatorsA practical reference to the SIP response codes dialer operators see most, what each means on outbound traffic, whose problem it is, and what to do about it.Tomás Herrera7 min
04
Buying & testing
How to evaluate a provider and prove a route before you move traffic.
- 12 Questions to Ask a Wholesale CLI ProviderTwelve questions that separate a reliable wholesale CLI provider from a risky one: routing, testing, quality data, compliance, capacity, billing and support.Mara Lindqvist7 min
- A 7-Day Route Acceptance Test PlanA day-by-day plan to accept a new wholesale voice route: baseline, CLI sampling, FAS checks, capacity ramp, peak-hour stability and a go/no-go scorecard.Mara Lindqvist7 min