Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate
2006-09-12
2006-09-12
Woo, Stella (Department: 2614)
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
C379S093170, C455S466000
Reexamination Certificate
active
07106838
ABSTRACT:
The present invention discloses a method for serving character message transmission during a telephone call over PSTN connected to the central office to which information terminals having displays are connected for telephone calls and for data communication, the method including the steps of: based on SMS message writing and transmission request for use of character message transmission service of the first information telephone subscriber during a telephone call between a first and a second information telephone subscribers among the information telephones, if the customer premise equipment (CPE) alerting signal (CAS) is transmitted from the first information telephone in order to secure data transmitting/receiving reliability, muting, at the first information telephone, a handset of the first information telephone, transferring the CAS to the second information telephone through the central office in order to data transmitting/receiving reliability, and receiving a first acknowledge (ACK) message in response; after receiving the first ACK message, transferring, at the first information telephone, a message to the second information telephone through the central office for notifying the second information telephone to get prepared for receiving the written SMS message, and receiving a second ACK message in response; after receiving the second ACK message, transferring, at the first information telephone, the written SMS message to the second information telephone through the central office, and receiving a third ACK message in response; and after receiving the third ACK message, releasing, at the first information telephone, the handset of the first information telephone, and maintaining a busy state between the first and the second information telephone subscribers.
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Kim Jin-Won
Ryu Young-Gyu
Bushnell , Esq. Robert E.
Samsung Electronics Co,. Ltd.
Woo Stella
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