On 03/20/2017 06:04 AM, PICI.1251 wrote:
> Hi to everybody,
> I would like to know if, with Linphone, there is a way to find other
> users on the internet, like I can do with Skype.
For federated services that relay SIP to work around IP4, this depends
on the service.  For instance, ekiga.net has a user lookup.  You first
have to know what service said person is using.  Skype is worse - it not
only can't lookup users not on Skype, it can't connect you when you do
find a sip/iax/facetime/gtalk/oovoo/other VOIP address for a party.  All
the SIP services can talk to each other (for the most part).

For decentralized SIP  (use IP6 and just connect directly to the other
party), DNS or Namecoin easily provide a directory - but no one is
forcing everyone to use the same standard/convention, or even to publish
their IP at all.  Lot's of people have a web page with their sip address
- you can just google to find those.   Skype and many SIP services will
connect you to POTS for a fee.  If you can find the telephone number of
your party, call them up and ask for their sip address.

I've found that email serves as a lowest common denominator.  Once you
find their email, ask them what their sip address is.

I've gotten the most buy in with the telephone model.  Your IP6 address
is your "phone number".  Especially when it is a cryptographic mesh ip,
such as cjdns (so that it stays with a device regardless of what ICANN
internet connection it is currently using and is authenticated).

Ask your friend for their "phone number", and add it to your local
directory - just like with a smartphone.

For example, if your friend [email protected] is on cjdns, and tells you
their ip is fc1c:d462:9ce6:0c52:4346:0965:a67d:ef22 (dummy ip with
private key discarded),  you would add the following to your linphone
directory:

sip:anne@[fc1c:d462:9ce6:0c52:4346:0965:a67d:ef22]

NOTE, at least on linphone-3.6.1, you have to switch between IPv6 mode
for direct connections, and IP4 mode for federated sip relay services,
and also switch your identity (which does not automatically switch when
switching IP mode).  This is annoying, and I hope that a convenient way
to switch appears soon - or else support for both at the same time!
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