20 maj 2010 kl. 17.52 skrev Bob Penfield: > I agree with Robert. B2BUAs should decrement Max-Forwards when they are > forwarding requests like a proxy does. I think the only case in which they > might reset it would be a situation like a PBX where it is originating the > call. > Right - so like I wrote - there's not a single rule, it depends on the application... But we should at least allow for this configuration-wise.
Thanks for the feedback. /O > cheers, > (-:bob > > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Olle E. > Johansson > Sent: Thursday, May 20, 2010 9:52 AM > To: [email protected] Implementors > Subject: [Sip-implementors] B2B UAs and Max-Forwards > > Here at SIPit we had a test involving B2BUA's in spirals and loops and other > dangerous situations. > > Robert Sparks and I ended up with a discussion about how B2BUA's should > handle Max-Forwards. > > http://tools.ietf.org/html/draft-marjou-sipping-b2bua-01 > The BCP draft clearly says that B2BUA's should RESET the Max-Forwards header. > > "Max-Forwards R Reset Max-Forwards when creating requests [3]" > > In appendix A. > > Robert meant that if we do NOT decrement max-forwards with one as we set up > the new call, we will cause endless loops. > > I'm stuck in between. In some situations, like a PBX, the new call is really > a new call. When using a B2Bua as an SBC, we do forward calls. > > What do you think? > > /O > _ _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
