Howto:Calculate Values for Type of Service (ToS) from DiffServ or DSCP Values

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Applies To

This information applies to all innovaphone devices

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Problem Details

The innovaphone devices allow you to specify the IP v4 TOS header field value used for voice and signalling IP packets. The configured value directly maps to the the header field of the IP packets. The IP ToS header field in the innovaphone device configuration must be provided as hexadecimal value for the 8-bit ToS field of the IP packet. This article describes how to deduce correct hexadecimal values from DiffServ / DSCP values.

DSCP, DiffServ and hexadecimal ToS values
DSCP Name DS Field Binary DS Field Decimal IP Precedence ToS Hexadecimal ToS Decimal Description
CS0 000 000 0 0 0x00 0
CS1 001 000 8 1 0x20 32
AF11 001 010 10 1 0x28 40
AF12 001 100 12 1 0x30 48
AF13 001 110 14 1 0x38 56
CS2 010 000 16 2 0x40 64
AF21 010 010 18 2 0x48 72
AF22 010 100 20 2 0x50 80
AF23 010 110 22 2 0x58 88
CS3 011 000 24 3 0x60 96
AF31 011 010 26 3 0x68 104 innovaphone default value for signalling RFC 2597
AF32 011 100 28 3 0x70 112
AF33 011 110 30 3 0x78 120
CS4 100 000 32 4 0x80 128
AF41 100 010 34 4 0x88 136 innovaphone default value for video RTP RFC 4594
AF42 100 100 36 4 0x90 144
AF43 100 110 38 4 0x98 152
CS5 101 000 40 5 0xa0 160
EF 101 110 46 5 0xb8 184 innovaphone default value for audio RTP RFC 3246
CS6 110 000 48 6 0xc0 192
CS7 111 000 56 7 0xe0 224

Related Articles

Howto:Firmware Upgrade V6 V7 and later#Default ToS Values

Howto:The IPv4 TOS field and DiffServ

Howto:Set Type of Service (ToS) DiffServ DSCP Values for innovaphone Windows Applications (SoftwarePhone, myPBX Video)

Reference9:IP4/General/Settings

Reference:Configuration/IP/Settings

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