题目内容
(请给出正确答案)
[单选题]
S1-MME接口消息标识中ATTACH流程解析中定义了request、()、complete等四种消息类型
A.response
B.failure
C.release
D.accept
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A.response
B.failure
C.release
D.accept
A.1
B.2
C.3
D.4
A、EPS attach
B、combined EPS/IMSI attach
C、EPS emergency attach
D、其它