Patent ID: 7106838
Filing Date: 2006-09-12
Classification: H04M

Abstract:
1. A method for serving character message transmission during a telephone call over Public Switched Telephone Network connected to a central office to which a number of information terminals mounted with a display, respectively, are connected for telephone calls as well as for data communication, the method comprising the steps of: based on Short Message Service message writing and transmission request for use of character message transmission service of a first information terminal subscriber during a telephone call between a first information terminal subscriber and a second information terminal subscriber among the information terminals, muting, at the first information terminal, a handset of the first information terminal, transferring customer premise equipment alerting signal to the second information terminal through the central office in order to accommodate data transmitting/receiving reliability, and receiving a first acknowledge message in response; after receiving the first acknowledge message, transferring, at the first information terminal, a message to the second information terminal through the central office for notifying the second information terminal to get prepared for receiving the written Short Message Service message, and receiving a second acknowledge message in response; after receiving the second acknowledge message, transferring, at the first information terminal, the written Short Message Service message to the second information terminal through the central office, and receiving a third acknowledge message in response; and after receiving the third acknowledge message, releasing, at the first information terminal, the handset of the first information terminal, and maintaining a busy state between the first and the second information terminal subscribers.