[SIPForum-techwg] TCP vs. UDP (SP adoption of TCP?)

[Hiers, David]

Typically, the maker of a sip server will quote one set of performance
numbers (simultaneous sessions, sessions per second, etc) for UDP and
another (lower) set for TCP for a particular hardware platform.  When I
go to the well to get capital, there is pressure is to prove why TCP is
better (to justify buying more hardware) or settle for UDP.



David Hiers

 

________________________________

From: Francois Audet [mailto:audet at nortel.com] 
Sent: Tuesday, May 20, 2008 4:52 PM
To: Joanne McMillen; Elwell, John; Hiers, David; Russell Bennett; Zweig,
Greg; techwg at sipforum.org
Subject: RE: [SIPForum-techwg] TCP vs. UDP (SP adoption of TCP?)


So, by now, most significant PBX & UC vendors on this list seemed to
have expressed support for the idea of making TCP either mandatory or at
least the recommended option.
 
I wonder just where the UDP perceived requirement comes from. I do not
think the "well, last time I try it, there was a lot of it" argument
holds water. And the idea of a race to the bottom (i.e., UDP) sounds
self-defeating to me.
 
 
 


________________________________

	From: techwg-bounces at sipforum.org
[mailto:techwg-bounces at sipforum.org] On Behalf Of Joanne McMillen
	Sent: Tuesday, May 20, 2008 16:43
	To: Elwell, John; Hiers, David; Russell Bennett; Zweig, Greg;
techwg at sipforum.org
	Subject: Re: [SIPForum-techwg] TCP vs. UDP (SP adoption of TCP?)
	
	
	Bingo...  ;-)
	 
	Joanne

		----- Original Message ----- 
		From: Elwell, John <mailto:john.elwell at siemens.com>  
		To: Hiers, David <mailto:David_Hiers at adp.com>  ; Russell
Bennett <mailto:Russell.Bennett at microsoft.com>  ; Zweig, Greg
<mailto:gzweig at sonusnet.com>  ; techwg at sipforum.org 
		Sent: Tuesday, May 20, 2008 12:14 PM
		Subject: Re: [SIPForum-techwg] TCP vs. UDP (SP adoption
of TCP?)

		Yes, this has always been the thing that puzzled me. A
lot of vendors
		and service providers have tried to reproduce PSTN
capabilities with
		SIP. Yet PSTN signalling protocols always ran over a
reliable transport,
		so the obsession with UDP seems to be a contradiction.
		
		John 
		
		



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