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

[Barbieri Davide]

Ok, perfect. In case of direct connection to the server without NAT, do you 
confirm that it's always necessary (from iOS 4.3+) to maintain a long run 
thread active to keep active the UDP socket?? This is my problem...

Davide



-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Gunnar Hellström
Sent: mercoledì 7 settembre 2011 10:15
To: address@hidden
Subject: Re: [Linphone-developers] R: Linphone iPhone background incoming call 
problem

Yes. With direct addressability, or a good SIP-aware network you do not
need any SIP-keep-alive.
But the environment for a terminal often varies, in some conditions you
need keep-alive, in others not.

I you want to auto-detect if you need keep-alive, then also RFC 5626
contains good advice.

/Gunnar

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

Barbieri Davide skrev 2011-09-07 09:45:
> Ok, I understand but if I don't wrong keep alive feature is useful only 
> behind a NAT.
>
> In a closed network with direct connection to the SIP server this expedient 
> is not needed and it's sufficient to keep active the receiving socket...
>
> Cheers,
>
> Davide
>
> -----Original Message-----
> From: address@hidden [mailto:address@hidden On Behalf Of Gunnar Hellström
> Sent: mercoledì 7 settembre 2011 07:44
> To: address@hidden
> Subject: Re: [Linphone-developers] R: Linphone iPhone background incoming 
> call problem
>
> For UDP, the keep-alive frequency needs to be 25 seconds, and is usually
> done with a SIP transaction of some kind.
>
> So, the device needs to do something 30 times more often than in the TCP
> case.
> The UDP keep-alive influences battery time quite a lot and can
> contribute to a resulting short battery time that makes the device less
> useful.
>
> Still, it would be better to support both UDP and TCP for SIP in the
> terminal, and leave the decision on what to use  to the service designer.
>
> Gunnar
>
> ___________________________________________________
> Gunnar Hellström
> Omnitor
> address@hidden
> +46708204288
>
>
> Barbieri Davide skrev 2011-09-07 01:48:
>> Ok, if we speak about the NAT limitation.
>> But just keep the UDP socket active to receive packets also when app is in 
>> background should not be a problem in terms of battery consuming. What's the 
>> difference compared to TCP in this case?
>>
>>
>> ________________________________________
>> Da: address@hidden address@hidden per conto di Gunnar Hellström 
>> address@hidden
>> Inviato: martedì 6 settembre 2011 22.08
>> A: address@hidden
>> Oggetto: Re: [Linphone-developers] Linphone iPhone background incoming  call 
>> problem
>>
>> Yes, TCP is good because of the lower frequency needed on the keep-alive.
>> RFC 5626 recommends 14 minutes keep-alive interval for battery operations.
>> http://tools.ietf.org/html/rfc5626#page-18    section 4.4.1.
>>
>> /Gunnar
>>
>> --------------------------------------------------------------------------------
>>
>> Simon Morlat skrev 2011-09-06 21:21:
>> I think there is a good one.
>> Most NAT routers (3g  and wifi) have timeouts>   30 minutes for TCP 
>> connections, while it is often less than a couple of minutes for UDP.
>> I don't know why this is like this, but it's a fact.
>> As a consequence there is a need for keepalive every minute for UDP to keep 
>> the connection up through the nat, while a keepalive every 30 mn is ok for 
>> TCP.
>> Thus TCP helps in preserving the battery.
>>
>> I suppose this is why Apple has interest to promote the use of TCP for its 
>> VoIP or IM applications instead of UDP.
>>
>>
>> Simon
>>
>> On 06/09/2011 10:10, Barbieri Davide 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 .
>>
>> 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>   [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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