Patent ID: 9531874
Filing Date: 2016-12-27
CPC Classification: H04M,H04W

Claim Text:
1. A method of telecommunication comprising: receiving, by the switching unit, a first callback request that requests a first callback after a first call attempted from a calling terminal of a calling subscriber to a target terminal of a target subscriber is unanswered; receiving, by the switching unit, configuration data regarding accessibility of the target subscriber; receiving, by the switching unit, configuration data regarding accessibility of the calling subscriber; the switching unit setting a set time for the switching unit to initiate the first callback to generate a second call between the calling terminal and the target terminal based on the configuration data concerning the accessibility of the target subscriber and based on the configuration data concerning the accessibility of the calling subscriber such that the set time is a time at which both the target subscriber and the calling subscriber are reachable for the first callback; managing a callback list of the target subscriber based on the configuration data regarding accessibility of the target subscriber and based on the configuration data regarding accessibility of the calling subscriber such that a priority of the first callback within the callback list is adjusted so that the first callback has a higher priority than an earlier entered second callback on the callback list based on availability of the calling subscriber that is identifiable from the configuration data regarding accessibility of the calling subscriber; and blocking the calling terminal and the target terminal for calls other than the second call of the first callback before the first callback is initiated by the switching unit.