# Add Additional IP to Switch

## Introduction 

Each Class 4 UI can support multiple dnl\_softswitch instance*.*  Each dnl\_softswitch can listen to one or more SIP IP:port.  

In the 

#### Step 1: Check the IP address in your server

You need to make sure the IP you want to use is available in the Linux environment where you are installing Class 4 dnl\_softswitch. You can use the following command to check all IP addresses:

```bash
ip addr
```

Once you confirm you have the IP address in your server's networking.  You can add the IP in UI:

#### Step 2: Go to VoIP Gateway setup page

You can click on "VoIP Gateway" on the top right menu.

![](https://4102392624-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MXPCJcszvw7MAuHjiRr%2F-MZ4wMqrKrbI1QyoskY0%2F-MZ5FYrua2VtQYqK9PSy%2Fimage.png?alt=media\&token=65efbfa1-67e0-4ec1-8fb4-85aed5662ba3)

#### Step 3: Add one ore more SIP Gateway

Each instance of dnl\_softswitch is one SIP gateway.  Each dnl\_softswitch has a private interface for the UI to manipulate with it.

![](https://4102392624-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MXPCJcszvw7MAuHjiRr%2F-MZ4wMqrKrbI1QyoskY0%2F-MZ4wTBVNHGwaMSAmE_z%2Fimage.png?alt=media\&token=3c36f496-7de8-45cb-9fff-1b6756c6fafd)

#### Step 4: Add one or more SIP Profile

You can expand on the SIP Profile within each SIP Gateway and add additional SIP IP to it.