diff options
Diffstat (limited to 'doc/ip-tos.txt')
| -rw-r--r-- | doc/ip-tos.txt | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/doc/ip-tos.txt b/doc/ip-tos.txt deleted file mode 100644 index 36febd99a..000000000 --- a/doc/ip-tos.txt +++ /dev/null @@ -1,81 +0,0 @@ -IP Type of Service settings for VoIP channels ---------------------------------------------- - -Asterisk can set the Type of Service (TOS) byte on outgoing IP packets -for various protocols. The TOS byte is used by the network to provide -some level of Quality of Service (QoS) even if the network is -congested with other traffic. - -* SIP ------ -In sip.conf, there are three parameters that control the TOS settings: -"tos_sip", "tos_audio", and "tos_video". tos_sip controls what TOS SIP call -signalling packets are set to. tos_audio controls what TOS RTP audio -packets are set to. tos_video controls what TOS RTP video packets are -set to. -There is a "tos" parameter that is supported for backwards -compatibility. The tos parameter should be avoided in sip.conf -because it sets all three tos settings in sip.conf to the same value. - -* IAX2 ------- -In iax.conf, there is a "tos" parameter that sets the global default TOS -for IAX packets generated by chan_iax2. Since IAX connections combine -signalling, audio, and video into one UDP stream, it is not possible -to set the TOS separately for the different types of traffic. - -In iaxprov.conf, there is a "tos" parameter that tells the IAXy what TOS -to set on packets it generates. As with the parameter in iax.conf, -IAX packets generated by an IAXy cannot have different TOS settings -based upon the type of packet. However different IAXy devices can -have different TOS settings. - -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. - -The lowdelay, throughput, reliability, mincost, and none values are -deprecated because they set the IP TOS using the outdated "IP -precedence" model as defined in RFC 791 and RFC 1349. They still -work in this version of Asterisk, but will be removed in future releases. - -=========================================== -Configuration Parameter Recommended -File Setting -------------------------------------------- -sip.conf tos_sip cs3 -sip.conf tos_audio ef -sip.conf tos_video af41 -------------------------------------------- -iax.conf tos ef -------------------------------------------- -iaxprov.conf tos ef -=========================================== - - -* REFERENCE ------------ -RFC 2474 - "Definition of the Differentiated Services Field -(DS field) in the IPv4 and IPv6 Headers", Nichols, K., et al, -December 1998. - -IANA Assignments, DSCP registry -Differentiated Services Field Codepoints -http://www.iana.org/assignments/dscp-registry - -To get the most out of setting the TOS on packets generated by -Asterisk, you will need to ensure that your network handles packets -with a TOS properly. For Cisco devices, see the previously mentioned -"Enterprise QoS Solution Reference Network Design Guide". For Linux -systems see the "Linux Advanced Routing & Traffic Control HOWTO" at -<http://www.lartc.org/>. - -For more information on Quality of -Service for VoIP networks see the "Enterprise QoS Solution Reference -Network Design Guide" version 3.3 from Cisco at: - -<http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a008049b062.pdf> - |