[SIPForum-techwg] TCP vs. UDP (actually, SIPconnect does *not* change SIP)

[Francois Audet]

Right: we are in agreement.

The problem with the alternative (allow UDP), is that it doens't fix the problems
introduced by UDP. It leaves it to the service operator to figure out how to deal
with fragmentation, congestion, etc.

Another way to do it is mandating TLS... 

> -----Original Message-----
> From: techwg-bounces at sipforum.org 
> [mailto:techwg-bounces at sipforum.org] On Behalf Of Elwell, John
> Sent: Monday, May 19, 2008 09:40
> To: techwg at sipforum.org
> Subject: Re: [SIPForum-techwg] TCP vs. UDP (actually, 
> SIPconnect does *not* change SIP)
> 
>  
> 
> > -----Original Message-----
> > From: techwg-bounces at sipforum.org
> > [mailto:techwg-bounces at sipforum.org] On Behalf Of Francois Audet
> > Sent: 19 May 2008 17:19
> > To: Eric Burger; Richard Shockey
> > Cc: techwg at sipforum.org
> > Subject: Re: [SIPForum-techwg] TCP vs. UDP 
> (actually,SIPconnect does 
> > *not* change SIP)
> > 
> > To be clear:
> > 
> > 1) I prefer MUST TCP
> > 2) I am ok with MUST TCP, MUST UDP, strongly RECOMMEND TCP
> [JRE] Eric is trying to avoid RECOMMEND, MAY, SHOULD etc. To 
> stand the best chance of interoperability I agree we should 
> avoid such options. I prefer MUST TCP - market forces will 
> require people to implement UDP too, but there is no need for 
> SIPConnect to specify UDP, and no need to test UDP for 
> SIPConnect compliance.
> 
> John
> 
> > 
> > > -----Original Message-----
> > > From: techwg-bounces at sipforum.org
> > > [mailto:techwg-bounces at sipforum.org] On Behalf Of Eric Burger
> > > Sent: Sunday, May 18, 2008 11:15
> > > To: Richard Shockey
> > > Cc: techwg at sipforum.org
> > > Subject: Re: [SIPForum-techwg] TCP vs. UDP (actually, SIPconnect 
> > > does *not* change SIP)
> > > 
> > > (1) I think you mean TCP is the default.
> > > 
> > > (2) What do we gain by mentioning UDP at all?  If there are
> > > 507 test cases for SIPconnect stuff, mentioning UDP means 
> there are 
> > > now 1014 test cases (507 for SIPconnect with TCP,
> > > 507 for SIPconnect with UDP).
> > > 
> > > Yes, not mentioning UDP, but still supporting RFC 3261, means you 
> > > don't get to not do UDP.  However, it makes SIPconnect compliance 
> > > testing and verification much easier.
> > > 
> > > [507 is just a random number; pick your guess as to what is the 
> > > right number.  The factor of two does not go away.]
> > > 
> > > 
> > > On May 18, 2008, at 1:36 PM, Richard Shockey wrote:
> > > 
> > > >
> > > >>
> > > >> I agree.  This was my concern when I read MUST TCP, but
> > > only MAY UDP
> > > >> in the document.
> > > >>
> > > >> I believe it is perfectly acceptable to say that
> > > SIPconnect compliant
> > > >> devices MUST support TCP, but there are a lot of UDP only
> > > devices in
> > > >> use within networks right now.  These need to keep 
> working when 
> > > >> connected with SIPconnect 1.1 compliant devices or no
> > > enterprise or
> > > >> service provider will have any interest in it.
> > > >>
> > > >> To my mind that means that both TCP and UDP are MUSTs.  
> > > But, perhaps
> > > >> TCP should be RECOMMENDed as the default transport (with
> > UDP as a
> > > >> fall- back)?
> > > >
> > > >
> > > > Chair hat off. Yes .. both are MUST but STRONGLY
> > > RECOMMENDED that UDP
> > > > is the default.
> > > >
> > > >
> > > >>
> > > >> Regards,
> > > >>
> > > >> Peter
> > > >>
> > > >
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