[Asterisk-Users] Cisco 7912 - how to ignore missed calls?

[Mark]

When a call comes into our office, it rings multiple Cisco 7912's (in 
Asterisk the dial command is just Dial(SIP/101&SIP/102&SIP/103.......)

Then when somebody answers the call, all the other phones stop ringing 
(of course).  The only problem with this is that all the other phones 
then display "1 New Missed Call".

Is there any way to disable the missed call message on the screen?

Thanks,
Mark