AltiGen comm ACM 5.1 - Manual (Page 180)

Chapter 12: Trunk Configuration
166 AltiWare ACM 5.1 Administration Manual
Figure 11. Setting the AA to play a prompt phrase
3. Set the Timeout to Repeat Current Level.
Figure 12. Setting Timeout to Repeat Current Level
4. Select a trunk as a testing reference—an analog trunk with a specific phone number
is best—and set the trunk In Call Routing to the Test Line Loss AA.