cover patch hunt doesn't work avaya R6

[mixtrix]

I've 2 call-app open on station 8888 and two station with brdg 8888.
the station 8888 go to cover 26 for busy goto vdn 1111.
vdn 1111 go to vector 22.
vector 22 go to annuncment 11 and than route to station 8888.
So if I call 8888 when the channel are busy, I listen the annuncment and then the call route to cover 26 , vdn 1111,vector 22, fine but the loop doesn't work !!!
the cover work just 1 time, why??????


Thanks