How can i disable call notifications for some users

I have my asterisk-IM working, how ever some users get to many calls an the call notifications drive them crazy, so i need to disable the call notication only, all other events should work, and for all other users call notifications should be working. Any ideas a i’m using spark as client. Any suggestion will be appreciated

bump, have the same problem would love to hear an answer.

my receptionists dont like it ethier so I jsut took thier phones out of the astarix mapping.

and they get no notifications. might seem like the quick dirty way to do it, but work nicely for me.