Re: [Sip] PING/PONG

On Dec 6, 2004, at 11:59 PM, Jonathan Rosenberg wrote:

>
>
> Robert Sparks wrote:
>
>> I hope we're talking past each other at this point.
>> You seem to be proposing that I would _never_ open a connection with 
>> anything but
>> one proxy, even if I had network visibility to something else and the 
>> knowledge that
>> I wanted to talk to it.
>
> No; I'm saying that opening one up as a result of a record-route is 
> not going to work.

Then we have been talking past each other. I wasn't suggesting you 
would.

>
>> I'm saying that if I want to have a dialog with something that I can 
>> reach (but it can't
>> open a connection to me), that I want to open a connection to it and 
>> for the duration
>> of that dialog, keep the connection alive. My original point is that 
>> I want to use the
>> same mechanism we define for keeping a connection to a proxy alive.
>
> I think its fine to open a connection to something else, then send it 
> a sip invite to create a sip dialog. What I think is a problem is 
> opening one up to an element whose address I learn from a record-route 
> after getting the 200 OK to my invite.
>
>> I think maybe you're only seeing the "tried to place a call and it 
>> ended up on some
>> random voicemail server" use case in your response below. Look at it 
>> from a
>> retrieving voicemail point of view. Then consider other services 
>> (like a presence server)
>> I might like to use, perhaps from a third party provider.
>
> Those are ok, since it looks exactly like the normal persistent proxy 
> connection case.
>
> -Jonathan R.
>
>
> -- 
> Jonathan D. Rosenberg, Ph.D.                   600 Lanidex Plaza
> Director, Service Provider VoIP Architecture   Parsippany, NJ 
> 07054-2711
> Cisco Systems
> jdrosen@cisco.com                              FAX:   (973) 952-5050
> http://www.jdrosen.net                         PHONE: (973) 952-5000
> http://www.cisco.com

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