2009/7/8 Klaus Darilion klaus.mailinglists@pernau.at:
I don't understand this. PATH is required when a registration is done through an outbound proxy, so the registrar routes request for that AoR using also through the outbound proxy (the RURI is the Contact of the REGISTER but the request is sent to the OBP.
E.g.: client <--->OBP<---->Registrar
If the Registrar does the NAT traversal, the NAT traversal mechanism must take into account the PATH, that means either:
- send OPTION requests to the client using a pre loaded route via the OBP
- send OPTION requests or emtpy CRLF packets with spoofed source IP (the IP
of the OBP)
If the OBP does the NAT traversal, the NAT traversal mechanism need not take care about PATH because there is no SIP proxy between the client and the OBP.
Yes, but what I mean is that in the above escenario PATH is required in order client to receive calls from Registrar (forget NAT now).