Patent ID: 9497604
Filing Date: 2016-11-15
CPC Classification: H04L,H04W

Claim Text:
1. A method for transmitting a message by an inter-working function (IWF) in a message transmission system, the method comprising: receiving a message including a representative mobile subscriber integrated services digital network number (R-MSISDN) and an address of a recipient terminal from a transmission side; extracting a network access identifier (NAI) address of the recipient terminal from the message; acquiring routing information using the NAI address of the recipient terminal; rebuilding the message using the routing information by converting a representative international mobile station identity (R-IMSI) to IMSI and mapping the IMSI and the NAI; and transmitting the rebuilt message to the recipient terminal based on the routing information, wherein the IWF receives the message on behalf of the recipient terminal having no mobile subscriber integrated services digital network number (MSISDN), wherein the R-MSISDN is allocated as an identifier of the IWF along with the R-IMSI mapped to the R-MSISDN, and wherein the IWF is determined based on at least one of the R-MSISDN and the R-IMSI.