# MicroSIP

> Connect the free MicroSIP softphone for Windows to a SIP device on your PBX.

- URL: https://kb.voipcloud.online/au/phones-and-apps/softphones/microsip/
- Section: Phones and apps › Softphones
- Type: guide
- Applies to: All countries
- Last reviewed: 2026-11-09

MicroSIP is a free, open-source softphone for Windows. You connect it to a **SIP device** on your PBX and use it with a headset.

## Before you start

1. Add a **SIP device** to the person's [User](https://kb.voipcloud.online/au/pbx/accept-make-divert/user/) under **Device configuration**, and click **Apply configuration**.
2. Open **Devices** at the top of the **PBX** tab and select the device. Keep its **SIP credentials** open: **Domain**, **Username** and **Password**.

The **Domain** shows the server address, a colon and the port.

If **Transport protocol** shows **TLS**, [TLS encryption](https://kb.voipcloud.online/au/pbx/settings/general-settings/) is on for your PBX. The port in the **Domain** is then different, and you must set the app to use TLS instead of TCP, with SRTP (shown as **Media encryption**).

Use each SIP device in one app or phone only. Signing in to the same SIP device in two places causes registration and call problems.

## Steps

**Note:** Menus can change between versions. If a label is different, check the vendor's own help.

1. Download MicroSIP from microsip.org and install it with the standard settings. When Windows asks, allow MicroSIP through the firewall.
2. Open MicroSIP, click the menu arrow at the top right and choose **Add Account...**.
3. Fill in the account:

 | MicroSIP field | What to enter |
 | --- | --- |
 | **Account Name** | Any name, for example your name. |
 | **SIP Server** | The **Domain**, including the colon and port. |
 | **Username** | The **Username**. |
 | **Domain** | The **Domain**, including the colon and port. |
 | **Login** | The **Username**. |
 | **Password** | The **Password**. |
 | **Transport** | **TCP**. |

4. Click **Save**.

![MicroSIP Account window with the SIP details blurred and Transport set to TCP](https://kb.voipcloud.online/au/images/phones-and-apps/softphones/microsip-account.webp)

Use **TCP**, not UDP. With UDP, MicroSIP can drop its registration from time to time.

## Check it works

1. In **PBX** › **Devices**, the SIP device shows **Online**.
2. Make a test call to check your headset's microphone and speaker.

If it stays offline, check the details and see [Softphone errors](https://kb.voipcloud.online/au/phones-and-apps/softphones/softphone-errors/). A device that tries to register with a wrong password is blocked, and the block lifts after 5 minutes.

## Related

- [Devices](https://kb.voipcloud.online/au/pbx/settings/devices/)
- [Network requirements](https://kb.voipcloud.online/au/getting-started/network-requirements/)