SIP.conf: [GENERAL] section: tos=

Set to value or

• lowdelay
• throughput
• reliability
• mincost
• none

Alternatively you can directly set the bit values:
 tos=0x18   ; where the tos bits are set individually and in combination
For example

tos=0x10	low delay
tos=0x08	high throughput
tos=0x04	high reliability
tos=0x02	ECT bit set
tos=0x01	CE bit set

or set multiple bits, such as

  tos=0x18 

to set both low delay and high throughput.

For Asterisk Deployments in DiffServ environments, tos=0xB8 will set the Diffserv EF (Expedited Forwarding) bits.

See also

• Asterisk sip channels
• Asterisk config sip.conf
• QoS: Overview of Quality of Service in IP networks

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