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Re: [Linphone-developers] iPhone can't receive calls issue after ~20 min

Subject: Re: [Linphone-developers] iPhone can't receive calls issue after ~20 minutes
Date: Thu, 4 Oct 2012 09:34:47 +0200

Hi David,

Are you using TLS transport? iOS version of Linphone doesn't works in background with UDP transport due to limitations of the iOS itself.

Check "Tips for developing a Voip App" section on:

if you google around the described process, you will find that in order to configure the sockets for VoIP usage, you must be using TLS transport.

Hope this information help...


2012/10/4 David Mayer <address@hidden>
Hi all,

I originally sent this to the users email list, but it appears to be rather "quiet", so I thought I'd try here too.

I have been doing some testing using the latest iPhone app from the app store.

The test is described below. All tests done using wifi always on.

1) Open the app and the app connects to a SIP server.
2) Ensure everything is working by making a call from a second client attached to the same SIP server. The linphone app rings as expected with call establishment working.
3) End the call
4) send the app to the background.  I do this by pressing the "home button" and then turn the screen off.
5) wait 20 minutes
6) attempt the same call described in part 2. This time the iPhone does not ring.
7) turning the phone screen back on and try a call again, still does not ring.
8) bring the app to the foreground and try the call again, this time it works.

Obviously, this issue is a pretty big show stopped in terms of using linphone as a serious SIP app.

I have tried this  with two different SIP servers and it yields the same results. This leads me to believe this is either an app setting issue or a bug with linphone.

Can anyone advise me on this issue? Android version of the app appears to be ok.

Any help greatly appreciated…even if it is just a work around.



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