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Setting up Zoiper with iPhone

Anthony Wong
Updated

Overview

Zoiper is a third-party SIP softphone application for iOS that can be useful for troubleshooting extension and call path issues within Sharpen. Both Zoiper Premium and Zoiper Lite are compatible with Sharpen when running on an iPhone. This article covers how to configure either version with your Sharpen extension credentials for testing purposes.

Important: Sharpen supports the use of Zoiper for testing and troubleshooting only. If you intend to use Zoiper in a production environment, you must purchase or download the appropriate version directly from the App Store. The Sharpen Care team is unable to provide support for third-party SIP clients.

Prerequisites

  • Zoiper Premium installed from the App Store, or

  • Zoiper Lite installed from the App Store

  • Administrator access to the Sharpen Portal

Configuration Steps

  1. Log in to the Sharpen Portal and navigate to Admin > Configuration > Extensions.

  2. Locate your extension and click Edit.

  3. Note the following fields — keep this page open to copy from during setup:

    • Username

    • Password

    • Server Address

  4. Open Zoiper on your iPhone.

Screenshot 2026-06-25 at 7.59.07 AM.png

  1. Tap Settings in the lower-right corner.

  2. Tap the + icon in the upper-right corner to add a new account.

Screenshot 2026-06-25 at 7.59.32 AM.png

  1. When asked if you already have an account, select Yes.

  2. Select Manual Configuration.

  3. When prompted for Account Type, select SIP Account.

Screenshot 2026-06-25 at 8.00.03 AM.png

  1. Enter an Account Name of your choosing, for example, John Doe - Sharpen.

  2. In the Domain field, enter your server address using the following modified format:

    • Remove the segment between the subdomain and the domain root.

    • Example: If your server address on the Extensions page is us1.vbx555.09.f.sipvbx.com, enter us1.vbx555.sipvbx.com in Zoiper.

  3. Enter your Username and Password from your Sharpen extension page.

  4. Optionally, enter a Caller ID.

  5. Skip the Advanced Settings and Additional Settings sections.

  6. Tap Register.

Once registered, the Registration Status will update to OK. You may see a battery life warning, this is expected and can be dismissed by tapping OK.

Screenshot 2026-06-25 at 8.00.14 AM.png

From the main screen, navigate to the dialpad to place a test call. Your extension is now registered and ready for testing.

Please remember use of 3rd party clients is not supportable by the SharpenCare team.

This article is part of a series on Admin Configuration topics.

Click here to access additional articles and topics.

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