### IP TOS values

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 Linux system you can use ef value in case your asterisk is running from a user other then root only when you have compiled asterisk with libcap.

The lowdelay, throughput, reliability, mincost, and none values are removed in current releases.