METHODS, APPARATUSES AND COMPUTER MEDIUM FOR DELIVERS SHORT MESSAGE SERVICE SMS BETWEEN USER EQUIPMENT WITHOUT MOBILE STATION INTERNATIONAL SUBSCRIBER DIRECTORY NUMBER (MSISDN) IN INTERNET PROTOCOL MULTIMEDIA SUBSYSTEM (IMS) WITH INTER-PUBLIC LAND MOBILE NETWORK (PLMN) HANDLING

摘要

Methods and apparatuses for SMS delivery between user equipment without MSISDN is provided. One method includes sending a SIP message, which may include an SMS payload, to the IMS network where the destination UE is homed, and determining whether the destination UE is IMS registered. If the destination UE is not IMS registered, then the SIP message may be routed to a default gateway which will attempt to deliver the SIP message by querying the serving MSC/SGSN information from the HSS. The method may include receiving an indication that the destination UE is unavailable and receiving the IMSI or correlation ID of the destination UE. The method may further include submitting the SMS to SMSC-A with the IMSI (or correlation ID) of the destination UE. If, however, it is determined that the destination UE is IMS registered and the SIP message was delivered to the destination UE, then the method may include receiving an acknowledgement that delivery was successful.