order to store it temporarily so that all the events concerning a same call are synchronized when they are received by said voice application application_number US 71231810 A description fig1 represents an embodiment 1 of the phone terminal according to the invention while it is transmitting and receiving signaling data on a circuit switched network 3 and on a packet switched data network 4 at the same time this terminal is connected to a base station 2 that belongs to the circuit switched network 3 and to the packet switched data network 4 in an alternative of this embodiment the connection to the packet switched data network and circuit switched network can be realized through two separate base stations this terminal 1 is exchanging with an enterprise unified communication server 7 communication events 6 on the circuit switched network 3 for basic services and other communication events 5 on the packet switched data network 4 for sophisticated services at the same time fig2 functionally represents one embodiment of the phone terminal according to the invention it comprises a software module 21 for a voice application including a signal processor 22 a software module 23 for storing into a shared first in first out memory communication events arriving via the circuit switched network 3 and communication events arriving via the packet switched data network 4 in order to synchronize these events a software module 25 for receiving communication events arriving via the circuit switched network 3 and a software module 24 for receiving communication events arriving via the packet switched data network 4 a software module 26 constituting a radio interface.