Re: [Ecrit] Later call-back

[Andrew Newton <andy at hxr.us>]

On Dec 1, 2006, at 8:58 AM, Henning Schulzrinne wrote:
> (4) New header or Contact parameter: Basically, the caller provides  
> the callee with a token that they can present later to prove that  
> the call is "special". This seems closely related to the REFER  
> problem and maybe we can re-use some of the same techniques.

This, to me, seems to be the most workable solution.

I do worry how such a call back will work with the current peering  
arrangements.  Even when other security mechanisms are in place,  
nearly every VSP locks peers down by IP address.  There would  
actually be nothing wrong with going directly to the UA, except for  
those wonderfully handy NATs.

-andy

_______________________________________________
Ecrit mailing list
Ecrit at ietf.org
https://www1.ietf.org/mailman/listinfo/ecrit