SQL : How many CAL for my application ?

Dear All,
I have 3 Windows services wich interract with a SQL server 2008 R2 database.
This 3 services are receiving some data from analyzer and store the informations in the database.
A front end application is making a connection directly on one of this 3 services to allow one Customer to review the data that are coming from the analyzers (data stored in the sql database).
With this situation, how must I to count the total of CAL's licence please ?
Need I only 3 CAL (one per Windows services), too pretty to be true, or one per analyzer + one per services + one per front end application ?one of this services has a final socket connection to another computer to send the reviewed results, is there also
a CAL needed for this socket connection ?
Thank you very much  for your support.
Best regards

Affirmative, there is no automatic check for currently used CAL-s.
Microsoft licensing phone number:
1-800-426-9400, Monday through Friday, 6:00 A.M. to 6:00 P.M. (Pacific Time)
Kalman Toth Database & OLAP Architect
SELECT Video Tutorials 4 Hours
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