About VoIP.info explains the scope of our independent research.
Start with primary evidence
Technical guides prioritize standards, official project documentation and manufacturer material. Provider facts retain their market and review date. Calling a country does not automatically establish that a service is available to buyers there.
Separate facts from guidance
Specifications and protocol behavior are sourced. Planning checklists and diagnostic reasoning are editorial guidance. Documentation-based examples are labeled; we do not claim that a configuration or device was lab tested without a recorded test environment and result.
Keep limitations visible
Supported, conditional, unknown, stale and disputed information are different states. Missing evidence does not establish compatibility. A phone catalogue entry does not promise a remaining support period, and a provider price requires its currency, billing period and conditions.
Compare without a universal winner
The public comparison places documented observations and open limitations side by side. It does not assign a universal provider rating or a personalized numerical match score. Use your own requirements and validate important details with the provider.
Commercial independence
Commercial relationships do not change technical facts, provider eligibility or editorial conclusions. Any active affiliate links must be disclosed. Read our affiliate disclosure.
Corrections and review
Review dates identify the evidence review, not a guarantee that every external service remains unchanged. See the corrections policy for the information needed to evaluate an inaccurate or outdated statement.