[Linphone-developers] R: Linphone iPhone background incoming call problem

[Barbieri Davide]

interesting... but as far as I know only media5 can receive incoming calls in 
background with UDP and without any notification. I've also noticed that while 
in background it sends REGISTERs every 90 s (without setting keep alive), 
instead of 600 s as  linphone does. Acrobits uses push notifications.

Do you think is that the "undocumented trick" to keep active the app without 
any timeout ?

Regards,

Davide
________________________________________
Da: address@hidden address@hidden per conto di Rene Dohmen address@hidden
Inviato: sabato 17 settembre 2011 12.36
A: address@hidden
Oggetto: Re: [Linphone-developers] Linphone iPhone background incoming call     
problem

Hi,
on a old (<4.3) sdk background mode with UDP works, if you have a decent 
router. (which keeps the UDP return socket open)
on 4.3+ the call for background mode fails with an error, the <4.3 sdk just 
doesn't return a error.

I mailed apple about this behaviour, they say they solved a bug in the 4.3 SDK 
-> returning an error.
So that's why it appears to work on a older version.

I'm still wondering how acrobit and counterpath's bria manage to do the trick.

Kind Regards
Rene
On Fri, Sep 16, 2011 at 12:19 PM, Barbieri Davide 
<address@hidden<mailto:address@hidden>> wrote:
They check if your app is a proper audio application (just seeing in the 
info.plist declaration). If it’s not you cannot have permission to play audio 
in background to do “something else” in the while. That’s what I read in some 
forums…


Currently i’m running linphone in background in debug mode since 3 hours ago 
and it’s still working… but why it doesn’t in release mode?? I cannot 
understand  that…

Davide

From: address@hidden<mailto:address@hidden> 
[mailto:linphone-developers-bounces+d.barbieri<mailto:linphone-developers-bounces%2Bd.barbieri>address@hidden<mailto:address@hidden>]
 On Behalf Of Jehan Monnier
Sent: venerdì 16 settembre 2011 12:09

To: address@hidden<mailto:address@hidden>
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call 
problem

How can Apple detect that ?

Jehan
www.linphone.org<http://www.linphone.org>






Le 16 sept. 2011 à 12:05, Barbieri Davide a écrit :


It’s very unlikely because Apple rejects your app using this trick and Media5 
is downloadable from the official Appstore…

Cheers

From: address@hidden<mailto:address@hidden> 
[mailto:linphone-developers-bounces+d.barbieri<mailto:linphone-developers-bounces%2Bd.barbieri>address@hidden<mailto:address@hidden>]
 On Behalf Of Jehan Monnier
Sent: venerdì 16 settembre 2011 11:37
To: address@hidden<mailto:address@hidden>
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call 
problem

Hi,
"undocumented trick": they probably play for ever a file with silence to 
prevent iPhone from sleeping.

Cheer

Jehan
www.linphone.org<http://www.linphone.org>







Le 16 sept. 2011 à 11:23, Barbieri Davide a écrit :



Hi,

i’m investigating on the problem of keeping alive linphone while in background… 
as you know from iOS 4.3+ the background feature doesn’t work in the current 
release of Linphone.

This is an official doc about executing code in background 
-->http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/BackgroundExecution/BackgroundExecution.html
Following this doc I moved  the “enter background” method in dispatch_async , 
so that a new parallel thread starts and effectively it works!!!

But another problem occurs: the background task can be kept alive for maximum 
10 minutes, after that the application is suspended by iOS and UDP socket 
doesn’t receive packets anymore… the keepAliveHandler triggers a new REGISTER 
request every 600 s but  few seconds after the application goes to sleep.
I tried created another parallel thread where a timer counts till 10,000 , but 
nothing changed.

The strange behavior is that if I start  the app in debug mode from XCode, it 
runs forever and can still receive calls ☹, but not when you start the app 
tapping the icon on the screen.

Media5 declares that their developers used an “undocumented trick”  
http://www.media5corp.com/en/ios-multitasking-and-battery to keep alive the 
background task. I tried and it works well without any time limit (also with 
UDP and without PUSH notification or something else).
Someone has some idea??

I was thinking about using local notification every 10 minutes, but you cannot 
execute code without user interaction. Playing a mute audio file is rejected by 
Apple.

Regards,

Davide


From: address@hidden<mailto:address@hidden> 
[mailto:linphone-developers-bounces+d.barbieri<mailto:linphone-developers-bounces%2Bd.barbieri>address@hidden<mailto:address@hidden>]
 On Behalf Of Stas Khirman
Sent: giovedì 8 settembre 2011 22:56
To: Simon Morlat
Cc: address@hidden<mailto:address@hidden>
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call 
problem

Simon & all,

Indeed it seems that typical default NAT timeouts are much longer then 5 min i 
mention. Please check page 7 of the 
http://research.nokia.com/files/tr/NRC-TR-2008-002.pdf . Also a lot of related 
info..

However, the main challenge with TCP wake-up is that while default timeouts can 
be quite large, it hard to predict configuration of NAT/firewall in each case. 
Interesting idea is described at 
http://www.cs.bham.ac.uk/~pxt/PAPERS/natTimeout.pdf . maybe t make sense to 
implement something similar...

Regards
Stas

On Thu, Sep 8, 2011 at 4:15 AM, Simon Morlat 
<address@hidden<mailto:address@hidden>> wrote:
Hi Stas,

1. See there, at the end "Voip sockets"

http://developer.apple.com/library/ios/#technotes/tn2277/_index.html
2. Nothing is documented. Apple has never stated that is was supported for UDP 
in any version. But it apparently worked in some version of 4.x OS before being 
removed.

3. From our experience we have not been aware of any cases where the TCP nat 
timeout was so short. If it really exists I don't see  any other solution and 
even how the iOS push notifications could work.

Regards,

Simon



On 07/09/2011 12:24, Stas Khirman wrote:
Sorry for dumb questions, but I do appreciate clarifications on the mentioned 
topics:
1. Where can I find documentation on "wake up on tcp " mentioned below
2. Did I understand correctly that this feature had been disabled in 4.3 and 
up? Any pointers on docs very appreciated
3. IMHO firewalls are keeping TCP ports open for about 5 min or less, so even 
if TCP SIP enabled it will not work reliably . Am I wrong.

Regards
Stas

Sent from my iPad

On Sep 6, 2011, at 1:10 AM, Barbieri Davide 
<address@hidden<mailto:address@hidden>> wrote:
Ok, thanks.

However, I can’t find a reason why Apple disabled this feature since 4.3+  ☹

From: Simon MORLAT [mailto:address@hidden On Behalf Of Simon Morlat
Sent: lunedì 5 settembre 2011 22:36
To: address@hidden<mailto:address@hidden>
Cc: Barbieri Davide
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call 
problem

Hi,

The only way to workaround this UDP problem is to force the iphone to stay live 
by creating a long running background task.
The result is that the device never suspends, which drains the battery very 
fast.

We don't plan to implement this.
Instead we recommend the use of a TCP/UDP SIP gateway, like our flexisip server 
running on sip.linphone.org<http://sip.linphone.org> .

Anybody can configure its linphone android or iphone to go through 
sip.linphone.org<http://sip.linphone.org> to use TCP instead of UDP.
It is rather simple:
domain: your voip provider domain
server: sip.linphone.org<http://sip.linphone.org>
Outbound proxy: yes
Transport: TCP

There is no need to create a SIP account on linphone.org<http://linphone.org> 
to benefit from this feature.

Regards,

Simon


On 05/09/2011 12:36, Barbieri Davide wrote:
Here you can read official doc for background support for TCP and UDP (as a 
data socket).
http://developer.apple.com/library/ios/#technotes/tn2277/_index.html

And how did Bria’s and Acrobits’ developers succeed instead ?

Cheers,
Davide

From: address@hidden<mailto:address@hidden> [mailto:address@hidden On Behalf Of 
Jehan Monnier
Sent: lunedì 5 settembre 2011 12:02
To: address@hidden<mailto:address@hidden>
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call 
problem

Hi,
From Apple's documentations, there is no trace of UDP support for voip socket 
at all. It used to work from IOS IOS 4.0 to 4.2, but from my understanding,  it 
has never been officially supported by Apple.

Cheers

Jehan
www.linphone.org<http://www.linphone.org>








Le 5 sept. 2011 à 11:30, Barbieri Davide a écrit :




Hi Jehan,

is there an official documentation by Apple which states that?

Davide

From: address@hidden<mailto:address@hidden> [mailto:address@hidden On Behalf Of 
Jehan Monnier
Sent: lunedì 5 settembre 2011 11:22
To: address@hidden<mailto:address@hidden>
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call 
problem

Hi,

It seams UDP background mode is no longer supported in IOS > 4.2. There is no 
obvious solution except using SIP TCP instead of UDP.

Cheers

Jehan
www.linphone.org<http://www.linphone.org>









Le 31 août 2011 à 10:20, Gunnar Hellström a écrit :





Sorry,
That Swedish comment was intended as a comment directly to Ludvig that happened 
to go to the list.

It merely meant: Good, and good that there are others who have reported the 
same problem.

Gunnar





-----------------------------------------------

Gunnar Hellström skrev 2011-08-31 10:12:
Bra,
Och bra att det finns en till som rapporterat exakt samma sak.

Gunnar
----------------------------------------------------------------------------------




ludvig davidsson skrev 2011-08-31 09:57:
Hi all,

I ran into the very same problem myself. This functionality appears to be 
broken in the Linphone app 1.0.6 present on the App store. No notifications 
show from incoming calls when, for instance, the home screen is visible. I have 
only tested the app on IOS 4.3.X
Does anyone know what might have caused this?

Regards,
Ludvig Davidsson

2011/8/31 rex tsai <address@hidden<mailto:address@hidden>>
Hi all,

 seems the function not worked from "iOS 4.3+"

     ref :  3/31 "It seems that background incoming calls don't work
any more, transport=UDP, backgroundMode=enabled."

 anyone have info about iOS or Linphone update ?



 With Regards,

Rex

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Stas Khirman
CoFounder & CTO
ChooChee Inc.
408-4803190<tel:408-4803190>


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