RE: [Sip] Question about Poll: Proposal relating to keepalive, TCP, and UDP usage in draft-ietf-sip-outbound

["Christer Holmberg \(JO/LMF\)" <christer.holmberg at ericsson.com>]

Hi, 

>Me too: I also agree with #1 and #2. But when Outbound is 
>used for NAT traversal I do not find #3 to add any value to 
>#1. Switchover to TCP (in the presence of NAT) can only be 
>used if the UA always keeps the TCP alive like in #1. The 
>additional UDP flow does not bring any significant value for 
>the deployment.
> 
>The only case where #3 might make some sense is that if 3GPP 
>wants to support multiregistration of a single UA over 
>different radio network types (cellular and WLAN) with 
>Outbound. That use case does not have anything to do with NAT 
>traversal, so keepalives would not be needed and switchover 
>from UDP to TCP could be made like in RFC 3261. 

I don't think we should rule out scenarios multiregistration with
Outbound in NAT environments. TISPAN has also been looking at Outbound
for certain multiregistraion scenarios.

Regards,

Christer


 
> >-----Original Message-----
> >From: ext Ben Campbell [mailto:ben at nostrum.com]
> >Sent: 31.December.2006 03:41
> >To: Adam Roach
> >Cc: Cullen Jennings; SIP
> >Subject: Re: [Sip] Question about Poll: Proposal relating to 
> keepalive, 
> >TCP,and UDP usage in draft-ietf-sip-outbound
> >
> >I concur with Adam, with the caveat that any unforseen complexities 
> >that might be introduced by the phrase "not have the size 
> limitations 
> >by using switchover" not block the work. That is, if 3 is free, or 
> >cheap, then great--but I would not want to significantly delay 1 and
> >2 in order to get 3.
> >
> >On Dec 30, 2006, at 7:06 PM, Adam Roach wrote:
> >
> >> I agree 100% with #1 and #2. I find #3 to be of dubious value, 
> >> although I see no harm in a solution that has that 
> property as well 
> >> (and you seem to get it for free if you satisfy #1 and #2).
> >>
> >> /a
> >>
> >>
> >>
> >> Cullen Jennings wrote:
> >>>
> >>> If the people who have been expressing strong opinions on the 
> >>> details of this proposal could comment on if they agree 
> with these 
> >>> high level goals or not, it would be really helpful for trying to 
> >>> get this draft to move forward.
> >>>
> >>> On Dec 16, 2006, at 12:33 PM, Cullen Jennings wrote:
> >>>
> >>>> Practically speaking given where we are today, I would 
> be a fan of 
> >>>> a solution that meant the following goals:
> >>>>
> >>>> 1) allowed deployments that wanted to use TCP to use TCP
> >>>>
> >>>> 2) allowed deployments that wanted to use UDP to use 
> only UDP with 
> >>>> the known limitations that the UA would not be able to 
> send large 
> >>>> requests
> >>>>
> >>>> 3) allowed deployments that wanted to use both UDP and 
> TCP to do so 
> >>>> and not have the size limitations by using switchover
> >>>
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> >>
> >>
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> >> sipping at ietf.org for new developments on the application of sip
> >
> >
> >_______________________________________________
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> >This list is for NEW development of the core SIP Protocol Use 
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> >
> 
> _______________________________________________
> Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
> This list is for NEW development of the core SIP Protocol Use 
> sip-implementors at cs.columbia.edu for questions on current sip 
> Use sipping at ietf.org for new developments on the application of sip
> 

_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors at cs.columbia.edu for questions on current sip
Use sipping at ietf.org for new developments on the application of sip