单选题一个正常的主叫UE12.2k电话信令流程是下列中的哪一项()ARRC连接建立?RAB指派?业务请求等直传消息?震铃和接通等直传消息;BRRC连接建立?业务请求等直传消息?RAB指派?震铃和接通等直传消息;C业务请求等直传消息?RRC连接建立?RAB指派?震铃和接通等直传消息;D业务请求等直传消息?RAB指派?RRC连接建立?震铃和接通等直传消息.
单选题
一个正常的主叫UE12.2k电话信令流程是下列中的哪一项()
A
RRC连接建立?RAB指派?业务请求等直传消息?震铃和接通等直传消息;
B
RRC连接建立?业务请求等直传消息?RAB指派?震铃和接通等直传消息;
C
业务请求等直传消息?RRC连接建立?RAB指派?震铃和接通等直传消息;
D
业务请求等直传消息?RAB指派?RRC连接建立?震铃和接通等直传消息.
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