Thanks, now I remember what to look for...
http://www.ciscounitytools.com/Applications/Audio%20Text%20Applications%20in%20Unity.doc.
Error Greetings
Easily the most misunderstood and overlooked item by Unity administrators. The first problem is by default this greeting doesn't even show up in the SA interface at all so folks don't even know it's there. And if they do, folks often don't understand what it does, exactly.
Step one is to expose it in the SA. This can be done using the Advanced Settings tool found in the âAdministration Toolsâ section of the Tools Depot. The option you want is âExpose the error greeting for subscribers on the SAâ - just set it's value to â1â and the âErrorâ greeting option will appear in the greetings drop down list for all subscribers and call handlers in the SA. Frankly I think this should be on by default but in early versions of Unity we got so many calls from folks wanting to know what this error in the SA was about the decision was made to hide it in the interface since at that time the need to customize the greeting's behavior was very limited. This is probably one of those decisions that needs to be revisited now that the product's matured some and the smart, good looking, savvy folks who are out there selling and installing it are ready to handle some additional complexity.