[Serusers] exec_dset() in failure_route

Hi, I'm trying to change the destination set of an request in a failure route using exec_dset(). My routing looks like route { ... t_on_failure(1); ... } failure_route[1] { revert_uri(); exec_dset("find-voicemail.pl"); t_relay(); break; } unfortunately, that does not seem to work, i get the following error from SER when a request hits the failure_route[]: Oct 1 14:33:17 graham /usr/sbin/ser[4814]: ERROR: t_forward_nonack: no branched for fwding Oct 1 14:33:17 graham /usr/sbin/ser[4814]: ERROR: w_t_relay (failure mode): forwarding failed Simply adding a static destination by append_branch() works fine, but that's only the solution for an announcement... I'd need something like exec_append_branch() ... So, is there another way to dynamically add branches? Any hints appreciated! Alexander Mayrhofer nic.at