Sorry, there is not!
The best removal "attribute" you have for the COS for the voice mail user is attrib #11:
"NO system PROMPT after GREETING, go straight to recording.!
There is a forum on AVAYA OCTEL messaging solutions here in Tek-Tips. Voice 100 is an VMX/OCTEL mashine.
I have earlier in that forum written about this (your) subject. In the next post I will paste the thread number.
doktor