Patent ID: 6707830
Filing Date: 2004-03-16
Classification: H04Q

Abstract:
A method for upgrading a terminal to terminal link within a telecommunication system, comprising the steps of:(a) sending a first link command frame generated via a first communication protocol from one or more transmit terminals to one or more receive terminals to try to establish a link, said first link command frame including an identifying byte field, wherein said one or more transmit terminals are capable of transmitting multiple link command frames associated with multiple communication protocols including said first link command frame and a second link command frame generated via a second communication protocol and said one or more receive terminals are capable of receiving different link command frames including said first link command frame and said second link command frame; (b1) determining if said link is established within a predetermined time interval; (b2) when said link is established, decoding a set mode command at said one or more receive terminals in accordance with International Telecommunication Union's Q.921 protocol specification; (c) responsive to said link not being established within said predetermined time interval, repeating steps through (b2) a predetermined number of times; and (d) responsive to said link not being established within said predetermined number of times, sending said second link command frame including a different byte field, wherein said determining step and said decoding step are repeated with said second link command frame, wherein further an attempt to establish said link utilizing said second link command frame is repeated up to said predetermined number of times or until said link is established.