AT Command +ECIPH URC的含义

[DESCRIPTION]
+ECIPH:<SIM_cipher_ind>,<mm_connection>,<cs_cipher_on>,<ps_cipher_on>上报各项的含义以及作用。
[SOLUTION]
+ECIPH URC 上报包括4个
indication:<sim_cipher_ind>,<mm_connection>,<cs_cipher_on>,<ps_cipher_on>，其中任意1个indication被触发上报，都会上报+ECIPH URC。
sim_cipher_ind是用来告知手机，当数据没有进加密状态时，是否允许手机showindicator告诉用户。
这个会在SIM初始化时，触发上报+ECIPH URC。
以下是spec的说明供参考：
GSM 02.07.
The ciphering indicator feature allows the ME to detect that ciphering is not switched on and to indicate this to the user, as defined in GSM 02.09.
The ciphering indicator feature may be disabled by the home network operator setting data in the "administrative data" field (EFAD) in the SIM, as defined in GSM 11.11.
If this feature is not disabled by the SIM, then whenever a connection is in place, which is, or becomes unenciphered, an indication shall be given to the user.
Ciphering itself is unaffected by this feature, and the user can choose how to proceed.
GSM 02.09.
The ME has to check if the user data confidentiality is switched on using one of the seven algorithms.
In the event that the ME detects that this is not the case, or ceases to be the case (e.g. during handover), then an indication is given to the
user.
<mm_connection>,<cs_cipher_on>,<ps_cipher_on>是用来通知手机CS,PS数据是否处于加密状态，这是通过网络下发的信令来通知手机的，发生场景基本上是在CS注册、PS注册，CS call、PS call时候(待机的时候Modem也会发起注册过程)，由网络来决定，是否cipher enable。
如果是cipher disable，再结合sim_cipher_ind看是否要show indicator。
可以通过下AT的方式来关闭+ECIPH的上报。
AT+EINFO=X.
bit6 of X 为0：disable +ECIPH.
bit6 of X 为1：enable +ECIPH.
BitURC
Bit 0+ESMLA
Bit 1+ECFU
Bit 2+ECELLINFO
Bit 3+ENWINFO
Bit 4+ESPEECH
Bit 5+EUSIM
Bit 6+ECIPH

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