This isn't 100% true. I've seen situations where loops occur in voice networks where you send a call to one of your carriers and receive the same call from one of your customers (who also happens to be a carrier) because your carrier's carrier is your customer.
Max-Forwards will eventually stop this loop if you're not doing loop detection. -Daniel On Mar 5, 2007, at 3:13 AM, YOSHIKAWA Tomoyuki wrote: > Hello, > > Epexegetically, > SIP responses trace a fixed-route which is indicated by Via header. > Via header is set, when SIP request is transmitted. > Hence, SIP responses do not loop. > It is unnecessary to use Max-Forwards header on SIP request. > > > > On Thu, 1 Mar 2007 16:51:12 -0000 > Attila.Sipos at vegastream.com (Attila Sipos) wrote: > >> >> The Max-Forwards header serves no purpose in SIP responses. >> >> It is used to check that a SIP request does not traverse >> too mnay hops. In other words it is a primitive tool to >> prevent a scenario where SIP messages loop infinitely >> (in the absence of loop detection algorithms). >> >> Regards, >> Attila >> >> >> >> >> -----Original Message----- >> From: sip-implementors-bounces at cs.columbia.edu >> [mailto:sip-implementors-bounces at cs.columbia.edu]On Behalf Of >> Satyendra >> Tiwari >> Sent: 01 March 2007 12:24 >> To: sip-implementors at cs.columbia.edu >> Subject: [Sip-implementors] Max-Forward Header >> >> >> Hello, >> >> Is Max-Forward header mandatory in SIP responces? >> If optional then why? >> >> >> >> >> >> Thanks And Regards, >> Satyendra Tiwari >> Alcatel-Lucent >> _______________________________________________ >> Sip-implementors mailing list >> Sip-implementors at cs.columbia.edu >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
