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When analyzing the number of traffic accidents within EU it is clear that critical point was reached in 1997, when over 60.000 people died on the European roads. Since then several Intelligent Transport System (ITS) services have been introduced in order to cope with this severe safety issue. Significant achievements have been made in the field of Incident Management (IM). The main IM objectives are to reduce the impacts of primary incidents and to avoid the secondary incidents. Main method for achieving these objectives is providing the necessary information about the incident to the actors involved in the IM process, as well as to the road users. The requirements which new cooperative systems have to meet are the basis for development of new services like Emergency Call (eCall). The realization of the eCall service comprises an introduction of new functionality into the vehicles such as “driver-independent” vehicle communication system. This system enables V2I (vehicle-to-infrastructure) communication and data exchange with the nearest dispatching centre, thus reduces the time needed for incident detection, verification and localization. V2I connection can be realized only through mobile networks. With the comparative analysis of the GSM/GPRS vs. IP network characteristics we highlight the main reasons for V2I transition to the IP networks. The paper focus is on presenting the basic system requirements for All-IP network eCall support.