Calling direct SIP addresses does not work anymore (Siphon 3.9.2)

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What steps will reproduce the problem?
1. Call SIP address i.e. 123567@test.dyndns.org

What is the expected output? What do you see instead?
In previous versions of Siphon on iOS 4.0 the call was successfull, now it 
simply says "Call failed".

What version of the product are you using? On what operating system?
Siphon 3.9.2 on iOS 4.2.1

Please provide any additional information below.
It would be nice if this would be working again, because so it is possible to 
make direct calls without the redirection over a server, which gives mostly 
better quality. Also the calls are always free. Please try to make it working 
again.

PS: I love Siphon!

Original issue reported on code.google.com by icke2002...@gmail.com on 5 Mar 2011 at 6:39

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Original comment by samuelv0...@gmail.com on 5 Mar 2011 at 11:41

• Changed state: Accepted

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It will be fixed in Siphon 3.9.3

Original comment by samuelv0...@gmail.com on 6 Mar 2011 at 10:57

• Changed state: Fixed

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3.9.3 release, you can update

Original comment by samuelv0...@gmail.com on 10 Mar 2011 at 11:23

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With Siphon 3.9.3 it seems to work. If I use WLAN everything works perfect, 
including audio transmission. 

But if I use UMTS there is no audio transmission and Siphon is not signaled if 
the called person ends the call. If I call normal telephone numbers using UMTS 
over my SIP provider it works perfectly. I have enabled the option "VoIP over 
EDGE/3G" and "Enable VPN".

Can you please take a look why calling SIP adresses over UMTS/3G results in no 
audio transmission samuel? Thanks in advance and also thank you for fixing the 
main issue.

Original comment by icke2002...@gmail.com on 12 Mar 2011 at 1:42

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It seems that my UMTS/3G problems come from my provider. I have tested an other 
SIP software on my iPod (Linphone from AppStore) with the same result - calls 
over my SIP provider poivy work perfectly, direct SIP calls are established but 
without audio transmission and signaling of the end of the call. Once testing 
this constallation my VOIP router (Fritzbox 7270) crashed as a result.

To use UMTS/3G with my iPod I use the mobile UMTS WLAN router Huawei E5.

Maybe the problem is caused by the two NATs, one of the provider, the other in 
the router.

I think I have to test it with my laptop and compare the results of wireshark 
when it is working over WLAN and when it is not working over UMTS/WLAN. I 
inform you if I have results.

Original comment by icke2002...@gmail.com on 13 Mar 2011 at 5:34

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If I set a STUN server in Siphon 3.9.5 it also works perfectly with UMTS/3G, so 
there is no problem anymore.

Original comment by icke2002...@gmail.com on 21 Mar 2011 at 6:50