Re: [Sip] Impossible to use real persistent connection with sip

["Vijay K. Gurbani" <vkg@lucent.com>]

James Ford wrote:
> An even simpler solution will be to add a parameter to the Via header
> such as pc; (or pc=1 so that we will not have troubles with
> Microsoft).  Pc stands for persistent connection.

We have debated this internally and arrived at the same preliminary
conclusion to use the parameter extensions of the Via header.  In
this manner, no special header is needed.

It also struck me while thinking about this problem that Rohan Mahy
has an I-D on connection reuse in SIP (see:
http://www.ietf.org/internet-drafts/draft-ietf-sipping-connect-reuse-reqs-00.txt)
While it does not explicitly talk about persistent connections and
peering relationships between proxies, it does discuss reusing an open
connection for requests in either direction.

> Guys, what do I need to do to move on this thing so that we will have
> a new draft to solve the problem?

I think we first need to identify if persistent connections falls in the
category of problems solved by Rohan's I-D.  If so, we pursue it in
that I-D.  If not, we can start a new I-D.

> I think many implementations will be interested in using a real
> persistent connection especially when TLS will be more deployed.

I think the issue will be more about peering relationships between
trusted entities where the trusted entities open and leave open for
a long time the TLS socket.  I don't think Rohan's I-D talks about
those scenarios, but I have not read it in a long while and plan to
do so in the next couple of days...

Regards,

- vijay
--
Vijay K. Gurbani  vkg@{lucent.com,research.bell-labs.com,acm.org}
Wireless Networks Group/Internet Software and Services
Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
Naperville, Illinois 60566     Voice: +1 630 224 0216



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