# UNIVERGE ST500

> Mobile softphone for business calls, integrating with desk phone systems. (iPhone/iPad app by NEC Corporation.)

- Source: https://appshunter.io/ios/app/univerge-st500/id1280247418 (this page in markdown: same URL + `.md`)
- Developer: [NEC Corporation](https://appshunter.io/developer/423274625)
- Category: Social Networking, Utilities
- Price: Free
- Rating: 3.00/5 from 9 App Store ratings · 31 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 87 MB
- Languages: American English, Arabic, Dutch, French (France), German (Germany), Italian, Japanese, Brazilian Portuguese, Chinese (Simplified, China), European Spanish and 1 more
- Released: 2018-09-04
- Data updated: 2026-08-15
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/univerge-st500/id1280247418/reviews.md

## What is UNIVERGE ST500?

Today’s competitive and fast past business environment means that employees are no longer bound to a desk - you need to be mobile and be able to work where your work takes you. NEC’s UNIVERGE ST500 softphones for iPhone allow you to make and receive calls from virtually anywhere, as if you were at your desk. While in the office connect to the Wi-Fi to handle your calls. While outside the office you can use your mobile data (3G / 4G) to handle you calls, and you can reduce incurring mobile call costs (See Notes below).

Deploying a ST softphone can save your company money by no longer having employees call-forward their desk phones to their mobile. Staff will also be able to make free internal calls and inexpensive local calls from the softphone rather than all calls being made directly from their mobile phone.

By only giving out your desk phone number (not your mobile number), you will always be contactable and you will only have a single call history and work voicemail to check. The ST500 simplifies your communications.

[Application features]
・Integration to iOS phone contacts 
・Call history (Missed / Incoming / Outgoing) grouped by contact
・Custom star code dial panel for quick dialling
・Hands-free mode
・Bluetooth Headset
・Video call(H.264/AVC)
・Voice codecs: Opus, G.722.1, G.711A/μlaw, G.722, G.729a
・Dial plan
・iOS CallKit support
・iOS PushKit support

[Call features]
・Security and encryption via TLS and SRTP
・Make and Answer calls
・Call waiting
・Hold / Retrieve hold
・Transfer
・Call park
・Station hunt groups
・Call pickup
・Dial DTMF (RFC 2833/In-band)
・Call forward – All, Busy, No Answer and Logout 
・Voicemail access and Message waiting indicator

NOTE: To work outside your corporate Wi-Fi, you will require a VPN connection or a Session Border Controller.

THE ST500 is free to use on your NEC Phone systems (SL2100, SV9100, SV9300 or SV9500), but requires an activation code that you can obtain from your NEC representative. It may also requires spare licences capacity on your phone system to create a standard SIP extension.

## Key features

- Make and receive business calls from mobile
- Integrates with iOS phone contacts
- Call history grouped by contact
- Hands-free and Bluetooth headset support
- Video call capabilities
- Security and encryption via TLS and SRTP
- Voicemail access and message waiting indicator

## Recent user reviews (10 of 31)

All indexed reviews: https://appshunter.io/ios/app/univerge-st500/id1280247418/reviews.md

### 1/5 — つかえない

*2025-08-21*

接続中のままつながらない。最悪のアプリ

### 1/5 — 社外内線の機能に疑問

*2025-08-14*

個人所有のスマホで社外内線として使っていますが、着信音の鳴りわけができないので、画面表示を確認しなければ、個人に掛かって来たものか、内線かの判別が出来ない。
また、Wi-Fiの兼ね合いからか、アプリの画面表示は左上に受話器マークが表示されているのにフリーズしているようで、着信が受けられない時が有る。
同様な症状はApple CarPlayに接続した時も現れる事が有り、使い勝手が悪く信頼性に欠ける。
これらの症状は一年前にメーカーに伝えたが、全く改善されない。
通話品質は悪く無いので非常に残念です。

### 1/5 — How to Debug?

*2024-12-04*

There is an option to adjust log level and even to export log files.
But those logs were password protected zips. We could not find any source to provide us a password for that.
So debugging seems quite impossible…

### 3/5 — Issue with Apple Car Play

*2024-03-24, version 8.3.17001*

The app interferes with Apple Car Play. It switches audio to the ST500 app as its running in background. There should be an update to make it friendly with Apple Car Play.

### 1/5 — iPhone 6 閃退

*2024-01-04*

It can’t be run @ios 12.

### 1/5 — 音声が小さすぎる

*2023-01-19*

音量を端末で最大にしても聞き取りにくい程音量が小さいです。その点を除いて使えますが、まともに聞き取れない様じゃ通話アプリとして使えない。

**Developer response:** ご利用いただきまして、ありがとうございます。
端末でのボリューム調整の他に、ST500の設定に音量レベルの調整がございます。下記設定の変更で調整頂けませんでしょうか？
ST500設定＞プロファイル一覧＞「プロファイル名」＞サービス設定＞音量＞スピーカー
初期値は0dBとなっており、最大+10dBまで上げることが出来ます。

### 1/5 — push通知が来ない

*2022-11-22*

販売店で設定完了しているがpush通知が来ないため電話が来てるからわからないから立ち上げっぱなしにしないといけない。
そもそもアプリ内のシステムの中のpush通知をオンにすると着信出来ない。

**Developer response:** ご利用いただきまして、ありがとうございます。
Push通知の着信については、ST500アプリの設定変更に加えてコミュニケーションサーバ側の設定変更、及びネットワークの設定変更が必要になります。お手数ですが詳細をお伺いしたくご購入頂いた弊社営業部門、もしくは、販売店経由でのご連絡を頂けますでしょうか。

### 2/5 — Bug with notifications and ios16

*2022-10-07*

With ios16, if ST 500 is not on the main screen, it doesn’t ring. And the notification doesn’t pop up.
It’s a real problem from a usage point of view. When will it be fixed?
Merci

**Developer response:** Thank you for contact us.
Please contact the NEC sales division or NEC Dealer.

### 5/5 — 安定してきた。

*2022-06-24*

リリース当初は使い物にならなかったが、やっと安定してきて問題なく使用可能になった。これからどんどん活用していきたい。

### 4/5 — 便利に使えます

*2022-06-15*

会社の電話が自宅でも利用でき、テレワークが加速しました？

## Frequently asked questions about UNIVERGE ST500

### What is UNIVERGE ST500?

UNIVERGE ST500 is a mobile softphone application that allows you to make and receive business calls from your iPhone or iPad as if you were at your desk. It aims to simplify communications and reduce mobile call costs for businesses.

### Is UNIVERGE ST500 free to use?

Yes, UNIVERGE ST500 is free to use on compatible NEC Phone systems. However, it requires an activation code from your NEC representative and may need spare license capacity on your phone system.

### What devices does UNIVERGE ST500 support?

UNIVERGE ST500 supports iPhone, iPad, and iPod devices. It is compatible with iOS versions and utilizes features like iOS CallKit and PushKit.

### Does UNIVERGE ST500 have ads?

No, UNIVERGE ST500 does not contain advertisements. It is a business communication tool designed for professional use without interruptions from ads.

### How does UNIVERGE ST500 help reduce costs?

It can save your company money by preventing employees from call-forwarding their desk phones to mobile numbers. Staff can make free internal calls and inexpensive local calls through the softphone instead of using their mobile plan for all calls.

### What call features are available in UNIVERGE ST500?

The app supports making and answering calls, call waiting, hold/retrieve, transfer, call park, station hunt groups, call pickup, and voicemail access with message waiting indicators. It also offers call forwarding options.

### How is my communication secured with UNIVERGE ST500?

UNIVERGE ST500 provides security and encryption for your calls via TLS and SRTP protocols. This ensures that your business conversations are protected.

### What are the voice codecs supported by UNIVERGE ST500?

UNIVERGE ST500 supports a range of voice codecs including Opus, G.722.1, G.711A/μlaw, G.722, and G.729a, ensuring high-quality audio for your calls.

## Version history (last 5 releases)

### 9.0.18002 — 2026-04-07

- Minor bug fixes.

### 9.0.18001 — 2025-10-10

- Minor bug fixes.

### 9.0.18000 — 2025-08-18

- OpenSSL 3.0.17 update

### 8.5.18000 — 2024-11-29

- OpenSSL 3.0.15 update
- Add a Wi-Fi or Mobile icon to the call history detail
- Supported iOS18

### 8.4.17000 — 2024-07-31

- OpenSSL 3.0.14 update.
- Opus 1.5.2 update.

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All apps by NEC Corporation: https://appshunter.io/developer/423274625

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*