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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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You need a PBX running somewhere for this to work which requires a net connectivity, but quite frankly the question you're asking is "putting yourself before the cart that draws the horse", i.e. catch-22! And Android does not support Ad-hoc networks... – t0mm13b Jan 11 at 16:43

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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.

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 :) – t0mm13b Jan 11 at 17:08
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? – Logos Jan 11 at 20:46
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. – t0mm13b Jan 11 at 21:15
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BOTH 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. – Logos Jan 12 at 2:06
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The Serval Mesh may accomplish what you are after. It allows mobile to mobile communication simply using the technology available in phones themselves. Also see this question/answer. Note the technology is currently in its infancy and still has many bugs/kinks to work out but the direction is promising.

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