DumpChan() — Dumps information about the calling channel to the console
Displays information about the calling channel, as well as
a listing of all channel variables. If
min_verbose_level is specified, output is
displayed only when the verbosity level is currently set to that number
or greater.
If you have many channel variables set, DumpChan() will show only the first 1,024
characters of your channel variable listing.
exten => s,1,Answer()
exten => s,2,DumpChan()
exten => s,3,Background(enter-ext-of-person)