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Re: [Linphone-developers] Linphone iPhone background incoming call probl


From: Simon Morlat
Subject: Re: [Linphone-developers] Linphone iPhone background incoming call problem
Date: Sun, 18 Sep 2011 16:01:03 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.21) Gecko/20110831 Thunderbird/3.1.13

Hi Stas,

Thank you for your interesting links.
The algorithms described in the second paper might be difficult to use in mobile environments. Indeed the client can be moving, in which case there is no reason that the timeout value be the same everywhere.

Simon

On 08/09/2011 22:55, Stas Khirman wrote:
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> wrote:
Hi Stas,

1. See there, at the end "Voip sockets" 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> wrote:

Ok, thanks.

 

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

 

From: Simon MORLAT [mailto:address@hidden] On Behalf Of Simon Morlat
Sent: lunedì 5 settembre 2011 22:36
To: 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 .

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

There is no need to create a SIP account on 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] On Behalf Of Jehan Monnier
Sent: lunedì 5 settembre 2011 12:02
To: 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

 

 

 




 

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] On Behalf Of Jehan Monnier
Sent: lunedì 5 settembre 2011 11:22
To: 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

 

 

 





 

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>

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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