how can proxies edit c line in sdp? which rules can be applied to c line by proxies?
I have a sip client behind nat which insert its own private IP at session level (c line under m line) and NAT adds its own public IP into c line at media level before forwarding 200 OK to proxy. Here, proxy removes c line at media level and forward 200 OK to ingress side with private IP at session level. Is it valid behaviour for proxies? On Thu, Jan 1, 2009 at 1:22 AM, Dale Worley <dwor...@nortel.com> wrote: > On Tue, 2008-12-30 at 22:37 +0800, Serbang, Nabam (Nabam) wrote: > > So how u1 knows where to send RTP packet. Usually it will send to > > address present in Contact header. > > U1 will *never* use the IP address in the Contact header to determine > where to send RTP packets, it will use the address in the 'c' line of > the SDP it receives. > > There are problems ensuring that each UA will receive SDP that contains > 'c' lines that contain usable addresses for SDP. ICE can be used by the > UAs to decide what addresses to use. Alternatively, the proxies > involved can edit the SDP to correct the 'c' lines in the presence of > NATs. > > Dale > > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > -- Erol Turaç _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
