Reject and accept are misinterpreted by the system--sound similar as two syllable words.  Consider a one syllable word for one of them--or words that are very very different to achieve the same goal.

Implemented
 
VMI responses can now be mapped in properties.txt.

VMIResponseMapping Maps VMI responses passed from a middleware system to other response choices. Enter a comma-separated list of values where odd-numbered values represent the middleware response choices and even-numbered values represent response choices that users will see and hear on their Vocera devices. The values are case-insensitive.

Example: The following property maps "accept" and "reject" to "affirmative" and "negative," respectively:

VMIResponseMapping =

accept, affirmative,

reject, negative