.. _class_of_service:

Class of Service
----------------

Customer administrators and higher level administrators can create and maintain
a Class of Service (CoS) that apply to subscribers. A CoS specifies the 
|Unified CM| and Calling Search Spaces (CSS) for a subscriber's line, thereby
indicating whether local, national and international numbers can be called.

An administrator can create a CoS at a customer level hierarchy.
A |unified CM| is specified. A drop-down list of those available at the customer
level is shown. 

Optional device and line CSSs can also be added - either selected from those
existing on the |Unified CM|, or else added. Macros 
can also be used when adding new CSSs, for example: ``CSS-Gold-{{macro.SITENAME}}``.

When a CoS is modified, the |Unified CM| cannot be modified.
In order to refer to another |Unified CM|, either clone an existing CoS
or else delete it and re-add it.







.. |VOSS-4-UC| replace:: VOSS-4-UC
.. |Unified CM| replace:: Unified CM