The possessive of the line of special number: if a special number made a call, the communication between the main machine and the plain number is terminated and the special number is on the line.

• 特护抢号功能的实现：当病员正在与医护人员通话时，如果有护理等级更高的危急病员呼叫主机，系统将中断正在进行的通话而接通危急病员的电话。