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Nixflex records the audio of every call and keeps it alongside the transcript, so you can listen back to anything your agent handled. Recording is on by default and can be switched off for an agent, or for a single number.
Switching recording off does not affect the transcript. Speech recognition runs independently, so you still get the full transcript, summary, sentiment and extracted data - just no audio file.

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Turning it off

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Per agent (dashboard)

Open the agent, find Call actions, and switch off Call recording. Every number on that agent stops recording from the next call onwards.

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Per number (API)

A single number can override its agent - useful when one client’s privacy policy forbids recording but the rest of your numbers are fine.
null is not the same as false. null means “no opinion, follow the agent”, so a null number under an agent with recording on will still record. To switch one number off while the agent keeps recording, send false, not null.
Agent-level can also be set through the API with record_call on Create agent and Update agent.

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What happens when it is off

  • No audio is captured at all. Nixflex never asks the carrier to record, so there is no file anywhere - not on your carrier, not with us.
  • recording_url is null on the call record and in the call.completed webhook. If your code reads that field, handle null.
  • Past recordings are untouched. Switching off applies to future calls only.
  • You are not charged by your carrier for recording those calls.

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Where the audio is stored

When a call ends, Nixflex downloads the file from your carrier, stores it in EU (Ireland) storage, and deletes the carrier’s copy.
This is what both carriers recommend. Twilio charges for recording storage and documents downloading recordings to avoid those charges. Telnyx keeps recordings for up to a year and advises fetching what you need in good time. Pulling the file to EU storage also keeps recordings inside the EU, which matters if your end-customers are covered by GDPR.
Recordings are deleted automatically after 90 days along with the rest of the call record - see Data retention.

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Reading a recording

The URL arrives in two places:
  • On the call record: GET /v1/calls/:id returns recording_url
  • In the post-call webhook: call.completed includes recording_url
If you need recordings for longer than 90 days, download the file from recording_url when the call.completed webhook fires and store it in your own system.

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Audio format

Dual-channel audio is easier to analyse per speaker. This difference is long-standing behaviour and is kept as-is so existing integrations are not changed.
Recording calls is regulated, and the rules differ by country and by state. In many places you must tell the caller the call is recorded, and in some you need their explicit consent. Nixflex does not announce recording for you - if you need an announcement, put it in your agent prompt or your greeting.

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Testing it

1

Switch it off

Turn off Call recording on the agent, or PATCH record_call: false on the number.
2

Make a call

Call the number and talk for a few seconds, then hang up.
3

Check the call record

GET /v1/calls/:id - recording_url should be null, while the transcript and summary are still there.
4

Switch it back on

Set it back to true, or null on the number to inherit the agent again, and call once more. recording_url should be populated.