CARRIER COMPARISON — all example data fictional
No Telnyx or Twilio call was placed to produce these files. A/B are invented route labels, not anonymized vendor results.

Use one completed outgoing carrier attempt per row. A retry is another attempt when measuring attempt-level answer fraction. Do not count multiple SIP messages or bridge legs as additional attempts. Keep a separate logical-contact metric if needed.
Use the same destination group, traffic type, approved caller identity, timing, codec/media policy and measurement window. Record account CPS and concurrent-call limits separately. A pending/unknown outcome blocks a settled-cohort calculation until classified; it is not zero or a dropped denominator.

Fictional expected results: A has 10 attempts, 6 answered, 60% answer fraction, 360 answered seconds / 6 = 60 seconds average answered duration. B has 10 attempts, 5 answered, 50%, 400/5 = 80 seconds. A01 is ANSWERED with 0 seconds, so answered_seconds > 0 is not a correct answer-event test. Neither result counts human conversations or establishes audio quality.
Grouping only ANSWERED rows produces 6/6 and 5/5 = 100%, not each route's answer fraction. Keep the overall attempt denominator; show disposition/SIP causes separately. Unknown/null answer evidence must be investigated under the documented source rules.

Decision worksheet:
Route / provider / region / quote date: Unknown
Cohort, interval, timezone and attempt identity rule: Unknown
Approved use and destinations: Unknown
CPS approved / observed peak; simultaneous channels approved / observed peak: Unknown
Authentication / TLS / codec / SRTP / media checks: Unknown
Attempts / answered / unknown: Unknown
Answer fraction numerator / denominator: Unknown
Average answered duration numerator / denominator: Unknown
Cause breakdown and post-dial-delay definition: Unknown
Audio, DTMF, teardown and bounded failover test result: Unknown
Equivalent billable units, minimums, rounding, support and exclusions: Unknown
Mandatory criteria PASS / FAIL / UNKNOWN: Unknown
Decision and limitations: Unresolved until actual comparable evidence exists
Next test / owner / date: Unknown