Re: [Uri-review] [sipcore] Proposal: sip6 URI scheme

Iñaki Baz Castillo <> Thu, 26 April 2012 09:31 UTC

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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <>
Date: Thu, 26 Apr 2012 11:30:52 +0200
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To: Rick van Rein <>
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Subject: Re: [Uri-review] [sipcore] Proposal: sip6 URI scheme
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2012/4/26 Rick van Rein <>nl>:
> I am developing to get better support for SIP over IPv6.  One of the
> problems that I have encountered is the interoperability between
> endpoints that run only IPv4 or IPv6.  To solve this situations prior
> to call setup, I am proposing a sip6 URI scheme.

Hi Rick, I'm pretty sure that's not the way to go. As Olle pointed out
a SIP URI with domain could point, after RFC 3263 resolution, to many
transport:address:port, some of them could be IPv4 and others IPv6.

Your proposal would indeed break existing implementations.

If for example alice uses just IPv4 and bob just IPv6, and both use
and register in a proxy/registrar with IP dual stack, alice should be
able to call bob's AoR ( without knowing that bob
is using IPv6 or not. This is already possible with current specs but
it would be not possible with your proposal.


Iñaki Baz Castillo