[Freeswitch-users] [gateways] remove/change "gw=********" in sip contact header (external gateway register)

Hello guys, We can add new parameters by setting "contact-params", but how do I remove the default parameter "gw =" in sip contact header during the external gateway register? I do not want that information becomes available to the external server. what is the correct way to do it? Regards, Doug