INTERNAL CALL SERVICE METHOD IN SWITCHING CENTER

摘要

The method calls a subscriber of a same group by the abridged dialling and tells the receiver that the call is from the same group. The call request between the inner line subscribers are controlled according to the grades of subscribers. The method includes steps; (A) checking the group ID on the subscriber information talb eand sending error message when the group ID is not exist; (B) checking the grade of the subscriber and the possibility of constructing the loop when there exists the group ID; (C) recording the receiver's phone number on the call buffer when the loop can be constructed; and (D) checking the state table of the receiver to send ring signal when the state of the receiver is free.