On Apr 17, 2007, at 9:22 AM, Paul Kyzivat wrote:
Francois Audet wrote:
Yes, that's exactly my point. If you're given a SIPS URI, use it.
Don't downgrade to SIP. Ever. Not at a proxy, not at a UA, not at
a user.
I think everybody agrees on this. So we are in agreement.
Well...
IMO its pointless to base any decisions on the assumption that
everyone will conform to the above.
It sounds good until a user with a UA that doesn't support sips
wants to call somebody that he only has a sips URI for. At that
point his choices are:
- give up
- try the downgraded URI
If there is *any* chance that downgrading will work then a lot of
users will try it. And even if there is *no* chance of it working
some number of users will try it. And its quite likely that often
the downgrading will be done by *mistake*, by somebody that does
understand there is a difference between sip and sips.
And it probably *will* work in a lot of cases, because a lot of
people will want to support both.
So, you can say that users SHOULD NOT do it, or MUST NOT do it, but
assume that it will be done anyway.
right.
My intent with some of my suggestions is to reduce the probability
that it will work, thereby reducing the inclination to try it.
I think it may also be important to address mechanisms for making it
obvious to the sender (as it already is to the home proxy, should
there be one that is used with outbound) that it will not work.
Separate registrations is one possible way to do this.
--
Dean
_______________________________________________
Sip mailing list https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [EMAIL PROTECTED] for questions on current sip
Use [EMAIL PROTECTED] for new developments on the application of sip
