asterisk users - May 2005 - Cisco ATA & Call Waiting

I currently have 2 Cisco 7960's and 2 ATA 186's connected to asterisk.
The 7960's work just fine for call waiting, but the ATA's dont. I cant
seem to get the ATA's to use the call waiting feature, the calls just go
straight to voicemail instead of prompting with the usual tone.
 
Please help
Chris
 

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