Although the use of maddr has dwindled over the years (especially since rfc3261 attempted to restrict it to multicast), some still use it. This includes potentially populating maddr with non multicast values.
RFC 3261 section 18.2.2 discusses sending responses to the maddr address. Bullet 2 also appears to imply that the maddr doesn't have to be a multicast address. This was Jonathan's reply concerning Via's maddr and the attempt to restrict the use of maddr. http://www.ietf.org/mail-archive/web/sip/current/msg07554.html > -----Original Message----- > From: [email protected] [mailto:sip- > [email protected]] On Behalf Of deepak bansal > Sent: Wednesday, May 11, 2011 6:01 AM > To: [email protected] > Subject: [Sip-implementors] "maddr" in Via Header in IPV6 > > Hi All, > > > was going through RFC 3261 and came through following line: > *"Usage of IPv6 multicast is not defined in this specification, and > will be > a subject of future standardization when the need arises"* > ** > So If we receive: > > INVITE message and > via Header Contains: "maddr" field (in IPV6) > > How we should respond to that method. will there be any response to > this > INVITE or will it be discarded. > > > Best Regadrs > Deepak Bansal > _______________________________________________ > 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
