out of curiousity, why do you need to disable OPTIONS? If asterisk is constantly sending OPTIONS queries, then set qualify=no in sip.conf and it will stop. qualify= means it uses sip options to ‘ping’ a device every minute or so to make sure it still has a connection and to renew NAT mappings if applicable.
sorry, no. I also can’t think of any good reason why your provider would request such a thing. Maybe he saw your asterisk server constantly sending an OPTIONS statement (because of qualify=yes) and wanted that killed? I think the only way to rip out the entire function is to edit the source code :\