> From: Jeroen van Bemmel > > I agree with your analysis for the most part. However, in case of an > end-point with no support or notion of this feature my original issue / > question still remains: How can the user indicate he wants to use this > feature? And before that, the other question is: how does the user learn > about the availability of this feature?
Those are significant and valid questions. If the UA doesn't understand how to implement some particular feature, how does it know how to detect the proxy's indication that the proxy can perform the feature? The only method that would work in this case is if it were extract the feature names from the response and display them as text strings to the user. It is not clear to me that there can possibly be any good method to solve this problem. In regard to user consent, presumably the user can control the proxy-agent by use of "feature codes", special dialing sequences that are intercepted by the proxy and interpreted to have specific meanings. For instance, in our call pick-up implementation, it is activated by dialing "*78" before the extension number that one wants to pick up from. Dale _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
