Abstract: A system and method for delivering a message waiting indicator (MWI) message to a wireless system, such that a Mobile Telephone Switching Office (MTSO) of the wireless system can recognize the MWI message and correspondingly activate an MWI on a wireless device (e.g., a wireless telephone). The present invention enables a messaging service provider, which is in communication with a wireline network through a central office, to send an MWI message through the central office and to a wireless device as a part of an integrated voicemail messaging service. According to one embodiment, the present invention processes a standard SS7 ReportEventMessageAvailable message, making the message compatible with a desired wireless protocol, such as analog, Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Global System for Mobile Communications (GSM). An MWI processor executes this process anywhere between, and including, the messaging service provider and the MTSO.

Abstract: Disclosed is a roaming service system in a CDMA service area for GSM service subscribers, which comprises a CDMA system comprising a CDMA HLR storing information on subscribers' locations and services, a CDMA MSC connected to the CDMA HLR and accessing calls, and a CDMA terminal wirelessly connected to the CDMA MSC and capable of having a SIM card removably installed therein; a GSM system comprising a GSM HLR storing information on the subscribers' locations and services, a GSM MSC connected to the GSM HLR and accessing calls, an authentication center (AuC) connected to a GSM network and authenticating terminals, and a GSM terminal wirelessly connected to the GSM MSC; and an IRGS connected between the CDMA system and the GSM system and converting signals to execute signal communications between the systems, and when a subscriber of a service provided by the GSM system moves to an area in which the subscriber can use the service provided by the CDMA system and installs the subscriber's SIM card