---
title: Wait Call
description: Wait for an incoming call on a real SIM, answer it, and score the audio quality.
lastUpdated: "2026-09-23"
---

> **For AI agents:** the complete documentation index is at [llms.txt](/llms.txt). Append `.md` to any page URL for its markdown version.

Wait for an incoming call on the SIM and answer it. Paired with [Place Call](/tests/actions/cellular/place-call) on another SIM, it verifies the full voice path; with recording and MOS enabled, it scores the audio quality the listener actually heard.

## Parameters

| Parameter | Required | Description |
| ----------- | ---------- | ------------- |
| Access technology | No | Network technology, including VoLTE profiles. Default: automatic. |
| Wait time | No | How long to wait for the call. Default: 30. |
| Record call | No | Record the received audio. Default: off. |
| Compute Audio MOS | No | Score the recorded audio against the reference file played by the caller. Requires recording. |
| Block until call received | No | Run synchronously (block the scenario) or watch in the background. |
| Call reception is optional | No | The test passes even if no call arrives. Default: off. |

## Results and metrics

In the action report (`result`):

| Field | Description |
|-------|-------------|
| `seconds_elapsed_until_accept` | Time before the call arrived and was answered. |
| `call_duration_seconds` | Time the call stayed up. |
| `caller_number` | The calling party's number. |
| `audio_mos` | The audio quality score (MOS), when recording and MOS are enabled. |
| `ceer_response` | The network's call end report. |
| `access_technology_report` | The technology used for the call. |

In Analytics, each run feeds the call measurement with `cellular_call_duration_seconds`, `cellular_audio_mos`, and `duration_seconds`, tagged by status, caller number, antenna, and access technology. `cellular_audio_mos` is the series to watch for voice quality degradation.

## What's next?

<Columns cols={2}>
  <Card title="Place Call" icon="phone-volume" href="/tests/actions/cellular/place-call">

    The other end of the voice test

</Card>
  <Card title="Alerts" icon="bell" href="/alerting/alerts">

    Alert when the MOS drops below your threshold

</Card>
</Columns>