Hi, Does anyone have experience with the Aastra 9133i and a PIX firewall? My problem is that it passes data with no problem at all (that being audio goes fine)... however my voicemail notifications do not work. If I take the phone OUT from behind the PIX firewall, voicemail notifications work. What do I need to do (on phone, firewall, or asterisk) to get the msgwaiting indicator to work?