# Export and Import SIP Extensions

Cloud Voice lets you move SIP (Session Initiation Protocol) extension data in and out of the system as a CSV file. Exporting produces a snapshot you can edit offline or reuse as a template, and importing loads that data back onto the phone system. This is the fastest way to add or update many extensions at once.

:::note
Exporting and importing SIP extensions requires administrator access to your phone system's management portal. If you do not see the **Export** and **Import** buttons, your account does not have this permission.
:::

## Export all extensions

Downloading your extensions as a CSV file gives you a working copy you can add to, trim down, or edit in bulk before loading it back in.

1. Log in to the Cloud Voice Dashboard at https://voice.izt.cloud and click **Login** to open your phone system's management portal with full administrator access, then open **Extension and Trunk > Extension**.
2. Click **Export**.

   The CSV file downloads to your computer. For a breakdown of each column and the values it accepts, see [Extension Parameters](/pbx/administrator-guide/import-and-export-parameters-extension/).

## Import SIP extensions

:::tip
Export your current extensions first and edit that CSV, instead of building a file from scratch. Starting from a real export keeps the column layout correct and saves time.
:::

### Before you begin

Your import file must meet these requirements:

- **Format**: UTF-8 encoded CSV
- **Size**: under 50 MB
- **File name**: fewer than 127 characters
- **Parameters**: every value must satisfy the field rules described in [Extension Parameters](/pbx/administrator-guide/import-and-export-parameters-extension/)

:::caution
When you finish editing the CSV, save it back as UTF-8 encoded CSV. Many spreadsheet apps default to a different encoding or file type on save, and a file that is not UTF-8 CSV, larger than 50 MB, or named with 127 or more characters will fail to import.
:::

### Import the file

1. Log in to the Cloud Voice Dashboard at https://voice.izt.cloud and click **Login** to open your phone system's management portal with full administrator access, then open **Extension and Trunk > Extension**.
2. Click **Import**.
3. In the dialog that opens, click **Browse** and choose your CSV file.
4. Click **Import**.

   The extensions from your file appear in the **Extension** list.