---
title: "Phone Modem"
description: "Phone Modem is a built-in integration for Home Assistant. It has 50 installs sharing analytics and works locally."
canonical: "https://vulpo.app/integrations/core/modem-callerid"
url: "https://vulpo.app/integrations/core/modem-callerid.md"
last-updated: "2026-10-22"
version: "1.4"
---

# Phone Modem

> Phone Modem is a built-in integration for Home Assistant. It has 50 installs sharing analytics and works locally.

Phone Modem is a built-in integration that connects a phone modem to Home Assistant. It works locally, so no cloud service is involved. It adds sensors and a button, and the button is used to reject an incoming call. Home Assistant can detect the modem by itself and offer to add it, and setup is done in the UI. Nothing extra needs to be installed, since the integration is part of Home Assistant.

Automatic summary of Home Assistant's source code. Something wrong? [Get in touch](https://vulpo.app/contact)

[Open in My Home Assistant](https://my.home-assistant.io/redirect/config_flow_start/?domain=modem_callerid)

## Supports

- **Works locally**: Talks to your devices on your own network. No vendor cloud in between.
- **Set up in the UI**: Add it in Settings, Devices and services. Nothing to download.
- **Found by itself**: Home Assistant spots it on the network and offers to add it.
- **Updated with Home Assistant**: Ships and updates with every Home Assistant release.

## Setting it up

Home Assistant usually finds it on the network and offers to add it. It can also be added by hand under Settings, Devices and services.

### Connect

- **Device**

Texts from Home Assistant's source code, [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0).

## Entities

- **Buttons**: Phone modem reject

## At a glance

- Kind: Built-in integration
- Category: [Presence and location](https://vulpo.app/integrations/category/presence-and-location.md), Phones and companion apps
- Number: 50 installs sharing analytics
- Connection: Works locally
- Upkeep: Part of Home Assistant
- Needs: Built into Home Assistant
- Domain: `modem_callerid`
- Source: <https://www.home-assistant.io/integrations/modem_callerid/>

In Vulpo: Button card, Chart card, Apple Watch

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about)

Last updated 2026-10-22. Source: https://vulpo.app/integrations/core/modem-callerid

---

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