In 2008, jointly with 4Play company, KOKTEYL has developed Tonlakazan system that operates on Turkcell RBT (Ring Back Tone) system and is started as a Turkcell service.

In this system, Turkcell users may assign the advertisement jingle of a company from www.tonlakazan.com as their ring back tones and earn credits when the callers listen to this jingle. By this means, the subscribers will have the opportunity to reduce their monthly phone costs while the advertising companies obtain a very efficient advertising opportunity. The advertising companies may view how many people have downloaded their advertisement jingles, how many people listen to these jingles and many other statistics instantly by logging on to www.tonlakazan.com using their corporate passwords. Since KOKTEYL has developed the whole software infrastructure of the system, special solutions could be developed for the advertising companies using RBT and Tonlakazan system.