Could you please help me, please to share how to load sip-router.cfg file inside running kamailio ?

the file is necessary to be load during rerouting kamailio gateway. I have 2 platform kamailio , both of them are failed to load sip-router.cfg file. They are apt kamailio installation source and the second is tar.gz kamailio installation source, which reload / restart kamailio process (and installation) were failed to load sip-router.cfg file.

Best Regards,