[Freeswitch-users] How to reject SIP messages based on user agent?

Hi list, I have a list of user agent regex pattern. For example: ^Asterisk PBX ^Zoiper ^SipP$ The list will have more and more members by time. All I want is to reject all the SIP messages (not only INVITE) that has User-Agent header value match any of the pattern in the list. How can I do that? I know this can be achieved with a sip proxy placed before FreeSwitch, but I don't want an additional SIP component for just that. Any help would be appreciated. rgds, Loi Dang Thanh Phone : +84. 1224.735.448 Email : loi.dangthanh@gmail.com