modparam("registrar", "path_mode",
0)
modparam("registrar", "path_use_received", 1)
modparam("registrar", "path_check_local", 1)
I have the latter set, but left the former two to defaults.
That may be the issue then, I think. The default for path_mode is 2:
"The path header is only saved into usrloc, if path support is indicated in
the registration request by the “path” option of the “Supported” header."