---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/32017#article
headline: "32017: PSTN: Carrier blocked call due to calling number (caller ID)"
url: https://www.twilio.com/docs/api/errors/32017
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 32017: PSTN: Carrier blocked call due to calling number (caller ID)

Log Type: APPLICATION

Log Level: ERROR

## Description

Intermediary / Carrier Analytics blocked call due to poor reputation score on the telephone number

### Possible causes

* The calling number has a low answer rate from end users
* The calling number generates low duration calls
* The calling number is responsible for large volumes of unwanted calls

### Possible solutions

Register the telephone numbers with the analytic providers. To reach the major mobile carrier's analytic providers, please register the telephone numbers at www.freecallerregistry.com . To reach T-Mobile's analytic provider directly to register numbers, please go to https://portal.firstorion.com to register numbers. Going direct to the analytic provider has a faster turnaround of being registered / call being delivered to end user