[Serusers] how to increment cseq? (for uac auth)

Hello, is there a simple method to increment CSeq of a branch? I have the following in failure_route: if (uac_auth()) { # mark that auth was performed setflag(7); # trigger again the failure route t_on_failure("3"); # repeat the request with auth response append_branch(); ----------> and here I'd like to increment CSeq t_relay(); } If CSeq is not incremented, this authenticated request does not work with RFC strict UAs, as discussed eg in this (http://lists.iptel.org/pipermail/serusers/2005-May/019806.html) thread. Now as I want to proxy auth an INVITE I am sending myself from sems I could do a dirty workaround: assume that the INVITE needs two CSeqs and increment cseq a second time for subsequent requests in sems. This is of course a hack but would save me from implementing auth in sems for the moment. Thanks for any suggestions Stefan