I'm looking for a way to make VoIP calls between two Android devices without having any intermediate server (SIP server) or an Internet connection. Is this possible?
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Why do you want to do this?– unforgettableidSupportsMonicaOct 13, 2015 at 11:21
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@unforgettableid It would be useful in emergency situations try reading this -> slideshare.net/altaiar/…– CrandellWSFeb 1, 2016 at 15:54
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@unforgettableid "Because it isn't there". This feature is potentially so versatile and useful that not wanting it seems inconceivable.– Russell McMahonApr 6, 2016 at 23:11
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@RussellMcMahon: Fair. It could be useful in remote locations, such as a secluded hiking trail or campground where there's no signal available.– unforgettableidSupportsMonicaApr 14, 2016 at 21:52
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@unforgettableid I'm hoping to implement this on phones we use so I can eg talk to my wife "around the property" without making a PSTN call. Serval also allows use of poweramps / external modems in some cases to allow substantrial direct range extension. The phone then is more a useful hardware element in a network than a phone per se. And Open WRT and Serval can be integrated in manners which I have not yet my brain properly acquainted with. ....– Russell McMahonApr 15, 2016 at 10:08
2 Answers
While I've not tried to use my phone like this myself, I found the question interesting enough to do a little googling. The best search term seemed to be android wifi|bluetooth walkie talkie
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The most promising free candidate I found looks to be Android Intercom - direct phone to phone communication over wifi or BT without an intermediary server or telco. The most promising paid for app seems to be WiFi Talkie.
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The OP indicated "without having any intermediate server (SIP server) or an Internet connection" which is going against the OP's requirement and question :)– t0mm13bJan 11, 2013 at 17:08
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How is "direct phone to phone communication over wifi or BT without an intermediary server or telco" going against the OP's req of "without having any intermediate server (SIP server) or an Internet connection", exactly?– LogosJan 11, 2013 at 20:46
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The linkys to your answer referred to using a Wifi mechanism, the OP did not give any indication of using intermediate server which includes SIP and presumably the OP wanted zero third party support, i.e. no wifi, no internet, no connectivity, no SIP.– t0mm13bJan 11, 2013 at 21:15
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1BOTH links are peer to peer solutions, though the second one does make use of any local wireless LAN (which doesn't require an internet connection. And you can use SIP without a third party - it's just a protocol, like TCP/IP.– LogosJan 12, 2013 at 2:06
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Logos> How do u use sip without a third-party (like a sip server) - any example code?– JasperOct 18, 2015 at 11:20