Hi I have a SIP PBX which works in B2BUA mode and I've noted that when it comes to dealing with Header fields, it doesn't stick to the table 2 in chapter 20.1 of RFC 3261. Specifically, it is modifying some header fields which according to that table may not be modifed by a proxy. I contacted the manufacturer and they claim that since a B2BUA isn't a proxy, they don't have to follow the rules established in the RFC and I'm having a hard time countering that since to me, a B2BUA is a proxy seeing as it does what a proxy does (even if the RFC doesn't spell that out) but I'm wondering:
Is there any type of UAS to which the header processing rules mentioned before do not apply? Is B2BUA really a loophole to not do things a proxy should do just because it isn't a real proxy per definition (even though it basically does the same things.. it just does more than a proxy does)? Regards Stephan _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
