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The allowable values for any of the tos* parameters are:
CS0, CS1, CS2, CS3, CS4, CS5, CS6, CS7, AF11, AF12, AF13, AF21, AF22, AF23,
AF31, AF32, AF33, AF41, AF42, AF43 and ef (expedited forwarding),
The tos* parameters also take numeric values.
Note that on a Linux system, Asterisk must be compiled with libcap in order to
use the ef tos setting if Asterisk is not run as root.
The lowdelay, throughput, reliability, mincost, and none values have been removed
in current releases.
2012-11-21