[Serusers] RTP Proxy errors

[sip]

Incidentally, in my version of the Getting Started doc (5? 5a? not sure... one
of the 5s), there's a block in the loose_route() section: 

if(nat_uac_test("19"))
            {
                setflag(6);
                force_rport();
                fix_nated_contact();
            };
            force_rtp_proxy("1");


That throws up an error that there's no such option as '1' to force_rtp_proxy()

Is that a typo on the option or a typo on the command? 


N.