This 30 second timeout problem has plagued Linphone users for years, and it has 
been brought up on many lists, with no real solution.
I was able to partially solve it on a local network by eliminating the use of 
TCP in the Network options. Just use
UDP. 
I was ecstatic.  Then I went to use it on a larger network, and it failed again 
in the same way. I do not understand this.

Bob

> On Jun 18, 2019, at 7:18 AM, Thomaier, Simon <[email protected]> wrote:
> 
> Hello all,
> 
> sorry, the mail was signed with a certificate, maybe thats why.
> 
> Here the original text:
> Hello all,
> 
> my setup is the Linphone App on Nokia 7.1 connecting to an Asterisk SIP 
> Server.
> 
> Incoming calls get dropped after 32 seconds each time.
> Outgoing calls work just fine.
> 
> Some researched showed it could be the 200 ACK packet that is not received.
> 
> I´m monitored all packages on the firewall, I see 200 ACK from Linphone to 
> the Asterisk but not from Asterisk to Linphone.
> After 32 seconds I get a TCP Retransmission from Asterisk to Linphone 
> followed by a BYE  
> 
> As a Firewall we use Sonicwall. so I tried to turn off the SIP Transformation 
> (SIP ALG) but it didn´t help unfortunately. Consistend NAT is enabled.
> 
> Do you guys have any hint to where to look further into? Running out of ideas 
> (google results) L
> 
> Thank you very much in advance.
> 
> Kind regards,
> Simon
>  
>  
>  
> Von: Linphone-users 
> <[email protected] 
> <mailto:[email protected]>> Im 
> Auftrag von Chris Woods
> Gesendet: Dienstag, 18. Juni 2019 11:49
> An: [email protected] <mailto:[email protected]>
> Betreff: Re: [Linphone-users] Call drops after 32 seconds
>  
> No diagnostic info or description of your testing? 
>  
> Regards
> Chris
>  
> 
> On Tue, 18 Jun 2019, 08:46 Thomaier, Simon, <[email protected] 
> <mailto:[email protected]>> wrote:
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