Turn Off MWI sign

[Matthias.]

Hello,

i've turned MWI subscription and it works fine so far.

If someone leaves a message the phone beeps an den voicemail sign turns
on.

Here ist the sip notify for turning the MWI

Code:

(6080) 16/08/04 13:26:02 - INFO:    --> :mwi --client_id=19735 --msg_num=1 --method="sipnotify" --on_string="172.16.9.54:5060/udp" --off_string="172.16.9.54:5060/udp" --extension="9906" --ctrl_user_number=""

Now if i read the message our voice server sends a sip notify for turning off the MWI.

Code:

(6080) 16/08/04 13:27:13 - INFO:    --> :mwi --client_id=19744 --msg_num=0 --method="sipnotify" --on_string="172.16.9.54:5060/udp" --off_string="172.16.9.54:5060/udp" --extension="9906" --ctrl_user_number=""

But the voicemail sign leaves on. Is there a switch or string needed to turn off the sign?

Thanks