On the mobile operator VimpelCom (Beeline trade mark) in St. Petersburg held its first in the world testing and demonstration of the technology Push-To-Talk (PTT), based on an open decision IMS (OMA PoC) and the transfer voice via GPRS / EDGE. The system was developed by Ericsson in accordance with the standards of OMA (Open Mobile Alliance). According to Ericsson, the main advantage of services Push-to-Talk on the basis of an open IMS solution is compatible with similar systems of other operators and support to terminals (mobile phones) from various manufacturers.