Creating Sites 
You must create one site per client for each company site in which telephone integration is to be used. It is not possible to create telephony servers until the site has been created.
In the navigation tree of SAPphone system administration, sites form directories to which the telephony server and protected extension numbers are assigned. They are displayed in the following format:
(Name of site - Local area code and general prefix of the site)
Example
Walldorf 06227/7.
Call SAPphone system administration (transaction SPHB).
Select
(Sites) in the navigation structure by double-clicking.
In the detailed view, specify the name and the generic telephone number of the site.
Save your entries in the detail view.