First try all of the relevant settings here.
http://tasker.dinglisch.net/userguide/en/androidpowermanagement.html
I assume you're getting your Android notification of a missed call. Correct?
You can also check the run log. Menu / more / run log. To see if the profile is firing.
To post your profile or task here... Long press on the profile or task name / ( 3 dot menu with 4.0+ ) export / export "DESCRIPTION" to clipboard (not XML)
Any linked tasks will be exported with the profile they are linked to..
To be able to export, The beginner mode needs to be off and the profile needs to be named by you (Not the Tasker listed name. Tasker will list your profile with the context name if you have not given it one).
Have you tried without 'ANY' in the match field of the 'Missed Call' event?
Also do something simple like playing a beep when the missed call occurs.