no hang up on A400E

Hello

I linked a PBX with an FXO line of an A400E.
The asterisk serves me as voicemail.
When I call a post on the PABX I come across Asterisk messaging through the FXS - FXO link. By cons when I hang up I see that the voice guides of the messaging continues to be broadcast and after about 30s due to the lack of action hooks.

the country is France

config FXO :

; Span 1: WCTDM/4 "Wildcard TDM400P REV E/F Board 5" (MASTER)
;;; line="1 WCTDM/4/0 FXSKS"
signalling=fxs_ks
callerid=asreceived
group=0
busydetect=yes
busycount=6
busypattern=500,500
answeronpolarityswitch=yes
hanguponpolarityswitch=yes
context=from-pstn
channel => 1
callerid=
group=
context=default

I have already set parameters to hang up but it has no effect. Do you have an idea?

thanks

command the answeronpolarityswitch=yes and hanguponpolarityswitch=yes if you not apply the polarity signal from the provider for the PSTN line.

if problem not solved, you can prepare teamview and add my skype:dario.hu2 for convinient contact.