Call Forwarding Busy 来电转接占线 ; 呼叫前转忙 ; 遇忙呼叫前转 ; 忙线时指定转接

call forwarding- busy line 呼叫传送占线

split call forwarding-busy line 分离呼叫传送–占线

multiple call forwarding-busy line 多重呼叫传送–占线

cfb call forwarding busy 呼叫前转忙

Call Forwarding On Busy 呼叫遇忙前转 ; 忙线指定转接 ; 遇忙呼叫前转 ; 或遇忙呼叫转送

call forwarding busy line 忙线呼叫转移

Multiple Call Forwarding Busy 多级呼叫转移

Call Forwarding when Busy 和遇忙呼叫转移