[Freeswitch-users] Lua question (re: FollowMe Dialplan Example from the docs)

Hello, The docs (https://freeswitch.org/confluence/display/FREESWITCH/Dialplan+FollowMe) have an interesting example, the snappily titled "FollowMe Dialplan Example 6". This looks interesting. But I have one concern, and being a Lua newbie, I don't know how to resolve it. My reading of the script is that it does not take care of the somewhat obvious problem of what happens if the cell phone goes to voicemail ? My understanding of the script as presented is that it would just sit there forever waiting for a reply ? Could a resident Lua guru kindly enlighten this newbie as to how I could timeout the session ? Thanks ! Bob