# Class of Service **Class of services** define a **[route](https://public.intellasoft.net/books/cli/page/route)** to take when an **[Extension](https://public.intellasoft.net/books/cli/page/extensions) is placing a call. A **class of service** can contain multiple components to place a call through in order of a priority system. These are explained in greater detail below. **[Hunt Groups](https://public.intellasoft.net/books/web-portal-dL9/page/hunt-groups)** as well as **[PhoneMap Groups](https://public.intellasoft.net/books/web-portal-dL9/page/phonemap-groups)** also must have a class of service defined to function properly. Most systems will have default **classes of services** (as well as routes) however additional ones can be created in the CLI for more advanced routing configurations.
- **Class of Service**: A Class of service can be defined to take another class of service - **Route**: A Class of Service can take a route which takes a trunk group, and then in turn a trunk. - **Phonegroup**: A class of service can directly call out to another **phonegroup**. - **Literal**: ??
# Adding an Extension 1\) Enter the CLI's configuration mode 2\) Enter the name of the **Trunk Group** you wish to create. You will be prompted with the minimum required settings. ``` vbox-nathan(config)# cos billing_reroute !! Notice: Editing new item: billing_reroute !! Notice: Minimum requirements needed for insert: !!   desc vbox-nathan(config-cos billing_reroute)# desc "Rerouted calls to billing from specific extensions" ```
3\) After this you will need to define the **includes** that the **class of service** will take. This can be done with the following command which takes a number indicating the first **include** that the **class of service** will attempt to take. ``` vbox-nathan(config-cos billing_reroute)# cos_include 1         ### first include that the class of service will attempt to take vbox-nathan(config-cos billing_reroute pos-1)# include         ### use tab to get a list of the potential includes that a class of service can take, remember you are not limited to just routes cos:internal               cos:internal+local         cos:internal+local+ld      cos:internal+local+ld+intl literal:catchall           literal:default            literal:services phonegroup:Billing         phonegroup:internal        phonegroup:outbound        route:A_Route              route:emerg                route:intl                 route:ld10 route:ld10_reg             route:ld11                 route:ld11_reg             route:local vbox-nathan(config-cos billing_reroute pos-1)# include route:intl vbox-nathan(config-cos billing_reroute pos-1)# exit vbox-nathan(config-cos billing_reroute)# cos_include 2         ### second include a cos will attempt to take vbox-nathan(config-cos billing_reroute pos-2)# include route:A_Route vbox-nathan(config-cos billing_reroute pos-2)# exit vbox-nathan(config-cos billing_reroute)# ```
4\) Use the **show** command to ensure your settings have been saved. In this example, we have only added 2 includes, but you are able to add as many as necessary. ``` vbox-nathan(config-cos billing_reroute)# show ! Generating running-config !!!   ! -------------- Class of Services ---------------- cos billing_reroute   desc "Rerouted calls to billing from specific extensions"   cos_include 1     include route:intl     exit   cos_include 2     include route:A_Route     exit   exit   exit ```
# Class of Service Settings Description You can also use the "**?**" key to view the description while in the CLI. \* indicates a required setting.
SettingsComments
cos\_includeCreate or change an include in this class of service
desc(\*) Description
doTo run exec commands in config mode
exitExit from this level (with notification of incomplete config)
noClear settings
reorderChange the order of class of service includes
showShow the running-config for the current item
include(\*) Item to include