Thomas,
SAP has process of certifying the CTI Integration, If a Integrator (Company) would like to have there product certified then SAP is going to have there certification engineer validate various CTI Call functionality like Agent Login/logout , Agent status, Alerting, Answering,transfers.......etc.
So if you are looking for any particular CTI, then you can search for the Integration company in
We have some of the CTI Application certificed by SAP and CTI Company.Let me know us know if you are looking for a specific CTI.
Thanks,
Vamshi Suddapalli
Solution Engineer
AMC Technology