iSip -VOIP Sip Phone
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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

(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.
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Phone Conference Feature


User Rating

4.5 out of 5

2 ratings in United States

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Ratings History


With ios14.2 don’t wok

Oteica on

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

Where is support or documentation

kansast on

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 ?

App keeps in crashing

Helifly on

I used to use this app daily. However the new version keeps on crashing every single time. Please fix soon thank you


Widmfmidkfn on

Don't waste yer money when I click call it does nothing

Used to work ... But not now...

kvesterling on

Upgraded app. Lost all custom accounts... Now it won't let me click Next to set up a custom account. No joy... Will only recommend to people I dislike. Media5 phone app however just works...

Won't keep account active

Timiller1826 on

It worked great for many years. Now, I must reenter my account information each time I want to use it. This may be a result of developer not keeping up with updates.

Silo Commander

Silo Commander on

New version 4.9 wouldn't save SIP settings. Rebooting seemed to have fixed it! Kudos to tech support for emailing me back!


David in Africa on

This used to be a great app. The latest version has a clock problem, Either easy night it will delete all your data at 24:00 or any time it crashes, which is fairly frequent. Emails to tech support always go unanswered. Now after 3 weeks, I consider this a fraud! BEWARE!

New version keep deleting my account

JosTanSing on

Hi I have been using this apps for quite awhile. No problem till I use the latest version. Can you fix the bug in your program? My account is always being remove after I close the app. Thanks

Updating clears accounts

cheez puffs on

I had sip working fine, updated the app via App Store, all account settings are gone, I have to readd them. Time consuming, not worth the effort.

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App Info

Langtian Du
English, French, German, Japanese, Korean, Chinese
Recent version
5.4 (6 years ago )
Released on
Feb 3, 2009 (14 years ago )
Last updated
2 weeks ago