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I have tried the SipDemo as a starting point of developing a softphone but have not yet modified the code. My sip credentials entered on SipDemo are working on other softphones and did a double check whether they are correct or not. The error code returned is -4(No data connection). I'm using an HTC wildfire S with android 2.3 as my testing handset.

When I googled around, I found that someone had the same problem and his solution was to hardcode tcp because the handset was not working with udp hence the "registration failed" message was shown.

Kumar Bibek
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Kat-la-kat
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  • I have [the same problem](https://stackoverflow.com/questions/30241756/failed-to-create-sipsession-network-unavailable), did you manage to resolve this? – EntangledLoops May 14 '15 at 15:56

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You can't really do anything apart from hardcoding the IP, if the device itself doesn't support udp. Some HTC devices are known to fail.

http://code.google.com/p/android/issues/detail?id=8407

Kumar Bibek
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