# iSip -VOIP Sip Phone

> VoIP SIP client for making and recording calls using SIP accounts. (iPhone/iPad app by Langtian Du.)

- Source: https://appshunter.io/ios/app/isip-voip-sip-phone/id298202722 (this page in markdown: same URL + `.md`)
- Developer: [Langtian Du](https://appshunter.io/developer/1155770837)
- Category: Social Networking, Productivity
- Price: $5.99
- Rating: 4.50/5 from 2 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 11 MB
- Languages: English, French, German, Japanese, Korean, Chinese, Chinese
- Released: 2009-02-03
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/isip-voip-sip-phone/id298202722/reviews.md

## What is iSip?

iSip, formerly sipphone. This is the first general sip client for iPhone.  This is also the first app on iPhone to record phone conference. 

Just use any voip provider, you can make sip call with this application. You can also setup the SIP server in your own organization, with this application, your iPhone is your extension. By the way you can record your conference with one tap a way.

The iSip application works on iphone, IPod Touch and iPad. 

With this application, user can make cheap VOIP calls when his/her IPhone or IPod Touch is connected to the internet via WIFI.

Feature Lists:
(1) support SIP calls
(2) support speaker phone
(3) support show voice mail 
(4) support multiple ringtone
(5) support DTMF during the call
(6) support G711 and GSM codec, iLibc and G722 codec for iPhone 3GS
(7) support to use alternative RTP port
(8) support stun server
(9) support global outbound proxy
(10) support proxy server for individual account
(11) support mute/hold call
(12) support multiple SIP accounts (able to set one default account for dial out)
(13) support dial from iPhone's address book
(14) support prefix for dialing from iPhone's address book
(15) support dial from recent calls
(16) shortcut to  regular cellular network
(17) full VPN support for enterprise customers
(18) support call transfer
(19) sip account setup wizard for more than 60 sip providers
(20) Record call conference
(21) Now support calls over 3G network
(22) Support private APNS server

Note: 
(1) This is SIP client software on iPhone, you need to have SIP account from SIP provider in order to use this software.

(2) For iPod touch 1st generation users, you need upgrade your iPod to iPhone/iPod OS 2.2 or above and you also need external MIC. 

We have tested this app with Macally iVoiceIII external MIC.

(3) SKYPE is not sip protocol, so this app does not support SKYPE account.

(4) Some mobile network operators may prohibit or restrict the use of Voice over Internet Protocol (VoIP) functionality over their network, such as the use of VoIP telephony over a cellular network, and may also impose additional fees, or other charges in connection with VoIP.  Please  check with your service provider before you use SIP call over 3G or Edge network.

(5)Changes in prefix settings:
Now we have prefix for each account, the prefix for each account  only works for calls made from address book.

When the per-account prefix is not set, the prefix in setting will be used, it works for all calls

Don't hesitate to contact our support if you have any questions about this app.

## Key features

- SIP calls
- Conference call recording
- Multiple SIP accounts
- Dial from address book
- Calls over 3G
- VPN support

## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/isip-voip-sip-phone/id298202722/reviews.md

### 5/5 — With ios14.2 don’t wok

*2020-11-15*

I love this app, but don’t work with iOS 14.2, please do something, please update, is a great app.

### 4/5 — Where is support or documentation

*2018-11-03*

Enjoying the app thus far.  Haven’t had a chance to use it much. Wondering about the ability to dial direct extensions inside our sip network ?

### 5/5 — Works wonderfully !

*2010-07-31*

I use this app with SipGate and Google Voice and I must say how happy I am !

I have Google Voice set up so that incoming calls are forwarded to my SipGate number. If iSip is closed, I get a push notification which allows me to answer the call. My ONLY complaint with this is that if the caller is not patient, he/she may hang up before iSip loads and answers automatically.

The push notification also shows caller ID in the form phonenumber@sipclient. It would be great if it integrated with the contacts, as this integration is limited to using the contacts app to call from within iSip.

I have read several reviews and I can tell MOST of the people complaining simply don't know how to configure it. Read the instructions people!

iSip does have room for improvement, but as it is right now, it works great for me and I'm really happy to have bought it ! I fully recommend it.

### 5/5 — How to work in background

*2010-07-20*

This is the developer, IOS4 does not support UDP running in the background. 

So we still use the push notification service to receive the incoming calls in the background. With the selection of our public push server or your local private push server (if your sip server can't be reached by our public push server), you should have no problem to receive the calls when the app is in the background. 

You can download the private push server vmware image from our website. Just make sure you have set up the virtual server's interface to bridge mode, so your isip can talk with the virtual server.

The IOS4 support gives you the possibility of  doing VOIP calls in the background and do other work in foreground. You can also go back and continue VOIP calls after the VOIP call is interrupted by cell calls.

### 3/5 — This app works but you need to configure it properly

*2010-07-05*

I downloaded iSip and it didn't work properly; Audio was so choppy that it couldn't be used (even on the same network than our Asterisk Server). Also under some conditions and I only got one way audio. I spent a complete day doing several adjustments and debugging the protocol to check what was happening. The application is now working fine (audio is good; Not excellent, but good enough). If you are planning to use this application; You must have really good understanding of VOIP and what is happening under the hood. For example; I am not a big fan of iSIP VAD implementation, I had to turn it off. Remember to set the stun servers if you are planning to use it behind a NAT; there are a few free stun servers on the internet. PUSH did work OK to me; although I can't answer the call when receiving the notification. IMHO there is room for improvement on this app. Buy it *ONLY* if you really know SIP protocol and you are willing to spend some time to configure/debug it to make it work correctly on your enviroment.

*** Please add g729 support ***

### 5/5 — Best user interface that works with Asterisk

*2010-05-27*

Downloaded 5 "SIP compatible apps" only to have iSip & WeePhone work with our internal Asterisk PBX. This app has decent call quality and has by far the best user interface of the apps that worked. I can now make phone calls from the bottom floor of our building that has no AT&T reception but excellent WiFi coverage. Save your self the cash of testing 5 apps and just purchase iSip.

### 4/5 — It works great!

*2010-05-27*

I have used it for a couple of weeks.
I set up my Voipon (UK) account and incoming and outgoing calls work perfect in both 3G or Wifi. 
When I receive a call, if the app is closed, I will receive a Push Notification, allowing me to take the call. Even when I am in the street connected by 3G. THAT IS GREAT! 
Support have answered promptly to me when requesting some information about the acc config. Some times, when 3G is not very good the quality of the voice decrease. (It's logic). The Developer needs to keep working on the UI (I think is very poor) and also the ring tones options. Other than that, for the moment the best Voip App I have tried.

### 1/5 — AVOID THIS APP:  It Simply doesn't work

*2010-02-26*

I used iSip in the past, but switched to Acrobits Softphone, which performed much better.   With the latest update to iSip, I figured I’d give it another chance.  To say I was disappointed is an understatement.   The program not only removes Google Voice integration, but much more significantly, it fails to connect to many SIP accounts -- sip accounts that work perfectly with other VoIP applications running on the iPhone.  Even activating iSip's built-in SIP account works only partially.  The account is registered by the application crashes almost immediately.

Additionally, the user-interface is so poorly designed that it renders simply operations virtually impossible to accomplish.  It's hard to design an application worse than this one!!!

In short, my opinion is that iSip is a total waste of money.  STAY AWAYS FROM THIS APPLICATION until the developers fix the acute problems that render the application useless (at least on my iPhone).

### 1/5 — Push notifications

*2009-12-06*

Tech support claims that push server was the issue although I don't trust that because it works on occasions every 10th attempt works and than when you get push message it gives you view or cancel and if you choose view it brings up the app but no answer option - you just lost a call. Cmon guys what good is your push option if you can't answer the call push notification just notified you about? Let's be real. Can you get someone to get that fixed for you? Obviously you can't do it but there are planty of people that can help you with it. Call developer of Ping! and I'm sure he can help you with such a crutial feature of voip software. I hope you read these comments and if you do you can see that half of the mist recent ones are about push issues.

### 5/5 — Best PDA SIP client so fat

*2009-10-16*

Coming recently from Windows Mobile I didn't expect much from SIP clients on a PDA but this thing is great.  Had one problem with static on outbound audio which developer addressed quickly.  Using with asterisk and am very happy - the only limitation (at least in the way I use) it is foreground use only which is an iPhone issue, not an issue with this app.  Recording may come in handy too!

If you need a SIP client then give this one a shot.

## Frequently asked questions about iSip

### What is iSip?

iSip is a SIP client application that allows you to make Voice over IP (VoIP) calls using your SIP account. It also features conference call recording and can be used to extend your organization's SIP server to your mobile device.

### How do I use iSip?

To use iSip, you need a SIP account from a SIP provider or your own SIP server. The app then uses this account to make and receive calls over the internet, either via Wi-Fi or a cellular data connection like 3G.

### Can iSip record calls?

Yes, iSip has a feature to record conference calls with a single tap. This allows you to save important conversations for later reference.

### What devices does iSip support?

iSip is compatible with iPhone, iPod Touch, and iPad devices. It also supports calls over the 3G network, in addition to Wi-Fi.

### Does iSip support multiple SIP accounts?

Yes, iSip supports multiple SIP accounts. You can set one default account for outgoing calls, providing flexibility in managing different communication lines.

### Is iSip free to use?

No, iSip is a paid application. The current price is $5.99. You will need to purchase the app to use its features.

### Does iSip have ads?

The provided data does not specify if iSip contains advertisements. However, as it is a paid app, it is common for such applications to be ad-free.

### How often is iSip updated?

The latest version of iSip is 5.4, which was last updated on January 23, 2017. This indicates that updates may not be very frequent.

## Version history (last 1 release)

### 5.4 — 2017-01-23

This app has been updated by Apple to display the Apple Watch app icon.

Please save the account information before upgrade. You may need to re-enter the account information.
Fix iOS 10 push issue

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## More apps by Langtian Du

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All apps by Langtian Du: https://appshunter.io/developer/1155770837

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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 2026-06-10.*