Most Unified Communication deployments today require end users to dial an 8 or 9 prior to making outbound calls. Meaning users are asked to use the ‘Edit Dial’ soft key when trying to dial back a number in their call history.
Yes, there are methods available to modify inbound calls by creating route patterns, translation patterns, calling party transformation patterns, updating device pools and editing gateway configurations. These processes can be cumbersome though as you must come up with one or more wildcard to match every possible number which might end up as a missed call.
The good news is that there is an easier configuration option that will save yourself on setup time AND save your end users from having to perform this bothersome step.