<div dir="ltr">Hi John, Hi Philippe,<div><br></div><div>Thanks for the post. I'd written this reply before Philippe posted, but not hit sent, sorry. Let me send it anyway.</div><div><br></div><div>To explain further: Unless one router extends the network of the other, each phone would be behind a firewall created by the router. So you'd have to place the phone in the DMZ or port-forward on the router. Using <a href="https://en.wikipedia.org/wiki/CSipSimple" target="_blank">https://en.wikipedia.<wbr>org/wiki/CSipSimple</a> might be especially helpful if you are doing point-to-point WiFi (without internet connection of either router). A "192.168.x.x" is network internal, so you won't be able to connect between "192.168.y.y". And even then, as Philippe points out, the address of the router may not be fixed.</div><div><br></div><div>However, if the routers are connected to the internet, it would also be possible to use commercial VOIP apps (like WhatsApp, Hangouts, Skype). I am not sure how they route voice traffic these days, but Skype used to allow peer-to-peer, which like Hangouts/WhatsApp should mean "peer-to-peer when possible". In any case, for an app that just "handshakes" via the internet, and then can use peer-to-peer, only the connectivity between the routers matters. A nice feature would be if the app told you what it's doing (p2p or via server) so that you know whether you're safe on WiFi or killing the internet connection...</div><div><br></div><div>There is an app called FireChat, that apparently can do p2p off-internet. It's proprietary, and I haven't looking into it much. However, it strikes me that such an app would be really useful, especially server-less, with the option to connect to a global network if available. </div><div><br></div><div>Is there anybody who wants to form a little action group to investigate?</div><div><br></div><div>Hope this helps!</div><div>Bjoern</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 10 January 2018 at 23:58, john whelan <span dir="ltr"><<a href="mailto:jwhelan0112@gmail.com" target="_blank">jwhelan0112@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">The problem was mentioned some time ago in reference to a refugee camp in Europe.<br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">You need <span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">csip simple and to know the phone's ip address.  IP checker is a simple free app that will how this.</span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">"</span><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">Just
 install csip simple and create a profile called "user", not linked to 
any server. 
To call another person with the same setup, you just need to know his ip
 address. Once they have sent it via voice, email, sms or whatsapp or ever 
(much better) a safer way like textsecure, you simply type 
"user@15.14.173 et cetera (basically user@ other person's ip) and their
Csipsimple will ring. 
It works and it's the purest form of Internet. "</span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">It doesn't have to be called user by the way.  So John or Mabel will work fine.  You do need the ip address so to call John it would be <a href="mailto:John@192.168.2.99" target="_blank">John@192.168.2.99</a> <a href="mailto:mabel@192.168.2.33" target="_blank">mabel@192.168.2.33</a></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">You do not need the router to be connected to the internet for this to work by the way.<br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">Cut and paste should work.  So stick the wifi router up high and you should be able to cover a fair range.</span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent">Cheerio John<br></span></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><span style="font:normal normal 400 normal 15px/19.5px "Roboto","Helvetica Neue",Helvetica,Arial,sans-serif;text-align:left;color:rgb(36,39,41);text-transform:none;text-indent:0px;letter-spacing:normal;text-decoration:none;word-spacing:0px;display:inline;white-space:normal;float:none;background-color:transparent"><br></span></div></div>
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