遇忙回叫 call back ; CCBS ; Call Back on Busy ; ACB
遇忙转移 If busy ; FORWARD BUSY ; Busy transfer
呼叫遇忙前转 Call Forwarding On Busy
遇忙记存呼叫 Registered Call
遇忙预占 Preoccupy On Busy
遇忙呼叫前转 Call Forward Busy ; CALL FORWARDING ON BUSY ; call forwarding busy ; CFB
遇忙返回 PNNI crankback PNNI ; Crankback
遇忙呼叫完成 completion of call to busy subscriber
遇忙时转移 If Busy
遇忙返回[再选 PNNI crankback PNNI
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