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Re: [Linphone-users] Unable to call SIP account

From: Stuart D Gathman
Subject: Re: [Linphone-users] Unable to call SIP account
Date: Tue, 21 Mar 2023 17:30:31 -0400 (EDT)

On Tue, 21 Mar 2023, Jaroslaw Rafa wrote:

Dnia 21.03.2023 o godz. 16:08:59 Stuart D Gathman pisze:
You don't need a service to call another SIP user.  Just modern internet
service.  If they don't have a DNS name pointing directly to their
SIP phone, use a raw IPv6.  Not much longer than a phone number.

Don't have a stable IPv6 because of travel through ancient Wifi
neighborhoods?  Use Mobile IPv6, or a VPN (Mobile IP6 is more
efficient).  By "VPN" I don't mean the type hawked on talk shows designed
to obscure your IP as a futile attempt at anonymity (use Tor),
I mean an IPv6 VPN.

Why do you recommend using IPv6 and not just IPv4?

1) There aren't enough IPv4 addresses.  There are twice as many people
   in the world, not to mention devices.

2) IPv4 has been obsolete at least 2 decades.

3) IPv4 NAT practices in common use prevent connecting directly
   to the callee because they don't have a stable public IPv4 in
   general.  (Another reason for SIP services - as a sort of TURN server
   for people in IPv4 NAT jail as well as bridging to telco and SMS.)

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