Jonathan, This may impact a b2bua, since the current max-fwds value probably isn't copied from the inbound leg to the outbound. Along those same lines, efforts to interwork H.323 and SIP and attempts to prevent loops by mapping the SIP callID to the H.323 conf id and back would also be more difficult.
david On Mon, 14 Jan 2002, Jonathan Rosenberg wrote: > > > Jasson Casey wrote: > > > I've been going back through the RFC(s) and have a > > question. > > > > Requests can illegally loop or legitimately spiral. My > > current understanding is that an illegal loop is > > present when there is a corresponding via entry > > already in the via stack, and the message has a > > similar vector as with the previous via entry. > > > > What does Loop detection accomplish that cannot be > > accomplished with the Max-Forwards field? > > > Indeed, a fine question, and the source of Open Issue #407, which > proposes to deprecate loop detection in favor of max-forwards. > > Loop detection has the benefit of detecting loops immediately, whereas > with Max-Forwards, they can loop around a few times till the counter > hits zero. However, I believe experience has shown us that the > complexities of detecting a loop vs. a legitimate spiral are > substantial, and the small imporvement in performance it provides is not > worth the cost. > > There has been little comment on the proposal to deprecate loop > detection; one email in favor, and a few questions. Without any > additional comment it will be removed from bis-06. > > Thanks, > Jonathan R. > > > -- > Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Avenue > Chief Scientist First Floor > dynamicsoft East Hanover, NJ 07936 > [EMAIL PROTECTED] FAX: (973) 952-5050 > http://www.jdrosen.net PH: (973) 952-5000 > http://www.dynamicsoft.com > > _______________________________________________ > Sip-implementors mailing list > [EMAIL PROTECTED] > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
