---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/17559#article
headline: "17559: Too many channels. Maximum is 2"
url: https://www.twilio.com/docs/api/errors/17559
inLanguage: en
dateModified: 2026-09-17T18:23:40.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 17559: Too many channels. Maximum is 2

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio failed to transcribe the audio because the file contains more than two channels. The transcription is marked as `failed`.

### Possible causes

* The recording has more than two channels, for example, a conference recording with several participants.

### Possible solutions

* Downmix the audio to stereo (two channels) or submit a dual-channel recording.

### Additional resources

* [Audio channel formats](/docs/voice/api/batch-transcription-resource#audio-channel-formats)