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What is Live Monitor?

Live Monitor lets an authorised person listen to an AI call as it happens - in real time, from a phone or tablet. When your AI agent answers a call for a business, the business owner (or you) can open the monitor app, see the calls happening live, and tap to listen in. You hear both sides: the caller speaking, and the AI replying, in sync. This is useful when a business owner is nervous about letting AI handle their calls. They can listen in, hear that the AI is doing a good job, and build trust - or catch a problem early. It is also handy for quality control and improving your prompts.
Live Monitor is listen-only today. Taking over a live call and transferring a call to a device are planned for later stages. This page covers listening.

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How it works

1

Enable monitoring on a number

Monitoring is controlled per phone number and is off by default. You turn it on with a single API call (see below). You can do this from your own application - for example, enable it automatically when a business upgrades to a premium plan.
2

A call comes in

When a caller reaches a monitored number, the AI answers exactly as normal. Monitoring does not change how the call behaves.
3

Listen live

The authorised listener opens the monitor app, sees the live calls on numbers they own, and taps Listen. They hear the full call - caller and AI - in real time.

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Enabling monitoring (API)

Monitoring is turned on and off through the API, so you can automate it from your own app. Full request and response details are on the Live monitor toggle API page. In short: 
# Turn ON for a number
curl -X PUT "https://api.nixflex.com/v1/integrations/monitor/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx" \
  -H "Content-Type: application/json" \
  -d '{"enabled": true}'

# Turn OFF for a number
curl -X DELETE "https://api.nixflex.com/v1/integrations/monitor/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"
Because this is a normal API call, you can wire it into your own product - enable monitoring when a customer subscribes to a plan that includes it, and disable it when they downgrade. The setting is stored on the number and persists across calls until you change it.

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Isolation and privacy

  • A listener can only see and hear calls on numbers they own (matched on the API key). One account can never monitor another account’s calls.
  • Enabling monitoring on a number does not, by itself, start any listening or recording - it only marks the number as eligible. Audio only flows while someone is actively listening.
  • Monitoring never affects the call itself. If monitoring fails for any reason, the call continues normally.

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Pricing

Live Monitor is billed as a small add-on to the standard voice rate, and only on the calls you can actually listen to (inbound calls on monitored numbers).
Per minute
Standard voice$0.08
Inbound call on a monitor-enabled number$0.09
Outbound call (any number)$0.08
  • The extra $0.01/min applies only to inbound calls on a number that has monitoring enabled - the calls a listener can tune into.
  • Outbound calls are always billed at the standard $0.08/min, even on a monitored number, because outbound calls are not monitored.
  • If you turn monitoring off, the number returns to the standard $0.08/min immediately.
You are charged the small add-on on every inbound minute of a monitored number, whether or not anyone actually listened. This keeps billing simple and predictable - one clear rate per number - rather than trying to measure exact listen time.

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Common questions

Yes. Enabling and disabling monitoring is a standard API call, so you can automate it - for example, turn it on when a customer upgrades to a plan that includes live monitoring, and off when they downgrade.
No. A monitored number answers and behaves exactly like any other number. Monitoring only marks the number as eligible to be listened to, and adds the small per-minute charge on inbound calls.
On a monitored number, inbound minutes are billed at 0.09/minwhetherornotanyonelistened,tokeepbillingsimple.Ifyoudonotwanttheadd−ononanumber,turnmonitoringoffanditreturnsto0.09/min whether or not anyone listened, to keep billing simple. If you do not want the add-on on a number, turn monitoring off and it returns to 0.08/min.
No. Outbound calls are not monitored and are always billed at the standard $0.08/min, even on a number that has monitoring enabled.
No. Listeners only ever see and hear calls on numbers they own, matched on their API key. Calls are fully isolated per account.