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Re: [Linphone-users] [Linphone-developers] serverless voip call

From: Tom Hartnett
Subject: Re: [Linphone-users] [Linphone-developers] serverless voip call
Date: Tue, 14 May 2019 13:12:58 -0400

We use this functionality quite a lot in Linphone, although we don't call within a local LAN much so the comments by Stuart are probably valid in your scenario regarding IPv6.
 just three comments on this:
1) We put the prefix "sip:user@:" in front of the IP address (e.g. sip:address@hidden). It seems to help Linphone know this isn't a phone number but a URI.
2) We've published a free "reduced feature set" version of Linphone for iOS and Android that might help you (assuming you don't need video). It's designed specifically to call without registration. If you simply key in an IP address it will complete the URI for you before making the call. It also keeps its own phone book, aside from the phone's main contact list. Search for "fieldtap" on the app stores.
3) It's entirely possible that if the receive side is registered, invites from destinations other than the registrar may be rejected.

On Tue, May 14, 2019 at 12:14 PM <address@hidden> wrote:
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Today's Topics:

   1. Re:  [Linphone-developers] serverless voip call (dinis braz?o)
   2. Re:  [Linphone-developers] serverless voip call
      (Stuart D. Gathman)


Message: 1
Date: Tue, 14 May 2019 09:54:27 +0100
From: dinis braz?o <address@hidden>
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Subject: Re: [Linphone-users] [Linphone-developers] serverless voip
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Message: 2
Date: Tue, 14 May 2019 11:51:54 -0400 (EDT)
From: "Stuart D. Gathman" <address@hidden>
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Subject: Re: [Linphone-users] [Linphone-developers] serverless voip
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On Tue, 14 May 2019, dinis braz?o wrote:

> The useage scenario is:? mobiles in the same wifi network but without access
> to server.
> I am looking for a way to make them call each other without needing a server
> User2 would dial address@hidden:5060??? targetting directly the
> user 1.
> No need for registration.

Yes, that is the primary way I use linphone.  Using IPv6, you can
call directly without being in the same wifi network - but as most
wifi (or mobile) routers in the US do not implement IPv6, you have
to install a VPN.  The IPv6 VPN I use is Cjdns - but the app for that
is not in an app store, and has to be installed manually.  I use
laptops.  :-)

In the peer-to-peer setup, the IP becomes the "phone number" quite
literally, instead of a metaphor when trying to explain IP to lay people.

Here is what an IPv6 peer-to-peer sip address looks like:

"John Doe" <sip:address@hidden:1328:adf1:bffe:4b6b:f53f:48ba:1882]>

The port 5060 is the default.

I have linphone-3.6.1, and unfortunately, an underlying library
recently decided that it didn't like sending certain SIP signalling messages
to a private IP like the above or 192.168.x.x.  It would attempt to send
from a public IP instead, usually resulting in failure (although it
works when the IPs are actually public).

The symptom is that the call works perfectly with audio both ways
for 30 secs - then gets disconnected when the caller times out waiting
for the call setup acknowledgement.

If your version is having that problem, you need to use public IPs,
which means using a VPN.  Using a public IPv6 via VPN effectively
works around the problem.

              Stuart D. Gathman <address@hidden>
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.


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