It will know because the UA send double-crlf. No? 

> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Christer Holmberg
> Sent: Thursday, May 08, 2008 01:17
> To: Juha Heinanen; Jiri Kuthan
> Cc: [email protected]; Audet, Francois (SC100:3055)
> Subject: Re: [Sip] Draft: draft-holmberg-sip-keep-00.txt
> 
> Hi,
>  
> I am NOT arguing against the fact that you can use CRLF 
> without negotation.
>  
> But, again, HOW does the edge proxy know that the UA actually 
> will use CRLF? If it doesn't know, it may use short 
> registration timer.
>  
> So, why don't we say something like:
>  
> "It is RECOMMENDED that the UA uses CRLF for TCP keep-alive 
> even if the UA doesn't receive keep=true, unless the UA 
> receives a registration refresh timer value which is equal or 
> less than the UA's default keep-alive interval in which case 
> the registration refreshes will act as keep-alives."
>  
> I think that is what Juha proposed some e-mails ago.
>  
> Regards,
>  
> Christer
>  
>  
> 
> ________________________________
> 
> Lähettäjä: Juha Heinanen [mailto:[EMAIL PROTECTED]
> Lähetetty: to 8.5.2008 9:28
> Vastaanottaja: Jiri Kuthan
> Kopio: Christer Holmberg; Hadriel Kaplan; Francois Audet; [email protected]
> Aihe: Re: VS: [Sip] Draft: draft-holmberg-sip-keep-00.txt
> 
> 
> 
> Jiri Kuthan writes:
> 
>  > For which sake sending a CRLF seems perfectly sufficient 
> to me, without  > any additional negotiation stuff.
> 
> jiri,
> 
> thanks for your support.  i forgot to mention that credit to 
> openser's CRLF implementation belongs to your ser group.
> 
> -- juha
> 
> 
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