Re: [Sip] a question on section 18.2.2 in RFC 3261

[Ryan Kereliuk <ryker@ryker.org>]

On Tue, May 27, 2003 at 11:27:28AM -0600, Wang, Jin-Gen wrote:
> 
> Since the Via header has enough information (IP address + port +
> transport protocol) for an application to send back response messages,
> what is the design idea behind the above decision to request an
> application to send back responses using an existing connection if the
> connection is still open, other than (may be) optimization in
> implementation? In other words, from SIP protocol point of view, why is
> such request a MUST requirement?

There are a variety of reasons why this is good including traversal of
of NAT/PAT devices.  I think the motivation for the text as written,
however, was to head off potential scaling and performance problems
associated with doubling the number of TCP/SCTP/TLS connections in use.

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