DECLINING A CALL

摘要

For a call to a user terminal (UT 1) for a satellite mobile telecommunications network, call initiation signals (S1-S7) are transmitted to the user terminal with a first relatively high link margin and a traffic channel (TCH) for the call is thereafter opened (S17) with a second relatively low link margin, wherein a determination of transmission quality is made (S9) using signals of the first relatively high link margin and if the determined transmission quality indicates that the traffic channel cannot be supported at said relatively low link margin, an indication (S9.5) is provided to the user of the terminal to allow the user to try to improve the link margin, and the call initiation is terminated if the determined transmission quality does not improve thereafter to support the second link margin for the traffic channel. A declining source (31) produces a declining signal when the user terminal is in a situation where its user may not try to improve the link margin, and a call release signal is transmitted (S10b) to terminate the call initiation in response to the declining signal when said determination indicates that the traffic channel cannot be supported at the second link margin.