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

"Olle E. Johansson" <> Thu, 26 April 2012 09:32 UTC

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From: "Olle E. Johansson" <>
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Date: Thu, 26 Apr 2012 11:32:53 +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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26 apr 2012 kl. 11:37 skrev Rick van Rein:

> Hello Olle,
>> A new URI scheme doesn't make any sense, since a SIP uri can be resolved to many different hosts using NAPTR/SRV records.
> This only helps with the SIP communication -- but it gives no certainty
> about RTP.  Interoperability between IPv4-only and IPv6-only relating to
> media can only be found when trying to setup a call, right?
But a URI scheme doesn't help here.
My softphone keeps moving between networks, some dual stack and some not.

>> A phone that is dual stack can register with two contacts, one for each address family. ICE will take care of media handling.
> There is no formal relation between the IP version used for SIP and used
> for RTP.  This is what I am proposing to solve with sip6:

The URI scheme is still WRONG. YOu might want to add a UA capability to the Contact registred.
That's something we should look into. Especially if you have a situation where a server needs to decide whether to force an RTP proxy or not.
According to the RFC the client should organize this itself with a TURN server, but in reality we might need to know on the server.

There's a separate SIPv6 mailing list operated by the SIP forum and a SIPv6 forum on Facebook if you want to join the discussion there too :-)