A cellular phone accessory device (47) combined with an IMS client (31) is implemented to provide real time interactive multimedia applications to low end phones (36) and middle range phones (40) without having to re-engineer said phones. Said device behaves as a cellular phone accessory and IMS client that is implemented using client control, protocol components (32) and IMS client media components (33). Said device comprises of general purpose processor (34) and digital signal processor (35) connected using a DSP bridge (46).