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DUSphone

DUSphone

Encrypted calls via dus.net

3 ratings
4 reviews
🔧 Utilities
💼 Business
Free

Details

  • Released
  • Updated
  • February 9, 2012
  • July 17, 2026

Features

Developer

dus.net GmbH
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DUSphone screenshot #1 for iPhone
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iphone
ipad
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FAQ↘︎
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About

This VoIP softphone allows you to make encrypted, HD-quality calls to landlines, mobile numbers, and other lines directly from your iPhone. It offers seamless integration with your device and ensures your conversations remain private. Manage multiple lines and keep track of your prepaid balance with ease.

✓Encrypted calling (TLS/SRTP)
✓HD voice quality (Opus codec)
✓Native call integration (Apple CallKit)
✓Reliable incoming calls (VoIP push)
✓Call landlines and mobile numbers
✓Multi-account management
✓Caller ID management
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What's New in DUSphone

7.1.2

July 17, 2026

More reliable incoming call delivery: your device now also announces its push token directly during SIP registration. Plus minor technical improvements.

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User reviews

Most RecentHighest RatedLowest Rated

Medium great

The app is a few years old, but so far it has done its job.

Since it is built on old technology iOS now shows this disclaimer:

These apps may slow down your iPhone and will not work with future version of iOS if they are not updated. If no update is available, contact the app developer for more information.

I am hoping there will be an update soon, because I like having this app available when I want to use my dus.net account on my iOS device.
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zepharius_againzepharius_again

Crashes immediately

Doesn't work. Why is this in the App Store?
MatthiMatthi

So stupid!

Once you get it, as soon as you open it, the thing keeps giving you reminders that say something like your account isn't credible anymore...I JUST GOT IT!!! Then when you go to call someone...EVERY NUMBER IS SUPPOSEDLY FAKE!!!!
HannyBear99HannyBear99

SUSphone

Stinks :(
SamuraiParkourSamuraiParkour

FAQ

What is DUSphone?

DUSphone is a VoIP softphone application developed by dus.net GmbH that allows users to make encrypted, HD-quality calls from their iPhone using their dus.net VoIP line. It integrates with Apple CallKit for a native calling experience.

How do I set up DUSphone?

Setup is fast and easy. You can scan a QR code from your dus.net customer center, eliminating the need to type in passwords. DUSphone requires an active VoIP line with dus.net.

Does DUSphone offer encrypted calls?

Yes, DUSphone provides encrypted calling over TLS and SRTP, ensuring that your conversations remain private. This is a key feature for users concerned about call security.

What is the call quality like with DUSphone?

DUSphone offers HD voice quality, powered by the Opus codec. This ensures clear and high-fidelity audio for all your calls, whether to landlines, mobile numbers, or other dus.net lines.

Can I manage multiple phone lines with DUSphone?

Yes, DUSphone supports multi-account management, allowing you to manage several dus.net lines simultaneously. This is beneficial for users who handle multiple business or personal lines.

How does DUSphone handle incoming calls when the app is closed?

DUSphone ensures you are always reachable. Incoming calls will ring reliably even when your iPhone is locked or the app is closed, thanks to its VoIP push functionality.

Is DUSphone free to use?

DUSphone is free to download and use. However, it requires an active VoIP line with dus.net, and calls are made using a prepaid balance which includes a starting balance of €0.45 for your first calls.

Does DUSphone have ads?

No, DUSphone is privacy-friendly and does not contain any advertisements. It is built on open-source software and focuses on providing a clean user experience.