Hi,

I'm looking for an option to mark CANCELs which are generated locally by Kamailio after receiving a 200 OK for another fork of the same call.

In the tm module documentation I found the option

local_cancel_reason

which enables this. This option is available (and turned on by default) in newer Kamailios. But we have a legacy system still running 1.5 (and we don't want to upgrade it anymore, it will be obsolete pretty soon), which doesn't have this option yet.

Is there a possibility to add a header to this locally generated CANCEL via some function in the config file, too?