Re: [Sip] PING/PONG

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.

> 
> 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

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