Do you have this parameter set?
* https://www.kamailio.org/docs/modules/stable/modules/registrar.html#registrar.p.path_use_received
Yes: ``` # ----- registrar params ----- modparam("registrar", "method_filtering", 1) /* uncomment the next line to disable parallel forking via location */ # modparam("registrar", "append_branches", 0) /* uncomment the next line not to allow more than 3 contacts per AOR */ modparam("registrar", "max_contacts", 3) /* max value for expires of registrations */ modparam("registrar", "max_expires", 300) /* min value for expires of registrations */ modparam("registrar", "min_expires", 60) /* default value for expires for registrations if not provided */ modparam("registrar", "default_expires", 120) /* avoid having registrations arrive at the same time */ modparam("registrar", "default_expires_range", 30) # +- 30% from default_expires modparam("registrar", "expires_range", 30) # expires within [0.7*expires .. expires] /* set it to 1 to enable GRUU */ modparam("registrar", "gruu_enabled", 1) /* set it to 0 to disable Path handling */ modparam("registrar", "use_path", 1) /* save Path even if not listed in Supported header */ modparam("registrar", "path_mode", 1) modparam("registrar", "path_use_received", 1) modparam("registrar", "outbound_mode", 1) ```