SimCom SIM7500 Series At Command Manual page 224

Defined values
<mode>
0 – buffer unsolicited result codes in the MT; if MT result code buffer is full, the oldest
ones can be discarded. No codes are forwarded to the TE.
1 – discard unsolicited result codes when MT-TE link is reserved (e.g. in on-line data
mode); otherwise forward them directly to the TE.
2 – buffer unsolicited result codes in the MT when MT-TE link is reserved (e.g. in on-line
data mode) and flush them to the TE when MT-TE link becomes available; otherwise
forward them directly to the TE.
<bfr>
0 – MT buffer of unsolicited result codes defined within this command is cleared when
<mode> 1 or 2 is entered.
1 – MT buffer of unsolicited result codes defined within this command is flushed to the TE
when <mode>
The following unsolicited result codes and the corresponding events are defined:
+CGEV: REJECT <PDP_type>,
A network request for PDP context activation occurred when the MT was unable to
report it to the TE with a +CRING unsolicited result code and was automatically
rejected.
+CGEV: NW REACT <PDP_type>, <PDP_addr>, [<cid>]
The network has requested a context reactivation. The <cid> that was used to reactivate
the context is provided if known to the MT.
+CGEV: NW DEACT <PDP_type>, <PDP_addr>, [<cid>]
The network has forced a context deactivation. The <cid> that was used to activate the
context is provided if known to the MT.
+CGEV: ME DEACT <PDP_type>, <PDP_addr>, [<cid>]
The mobile equipment has forced a context deactivation. The <cid> that was used to
activate the context is provided if known to the MT.
+CGEV: NW DETACH
The network has forced a Packet Domain detach. This implies that all active contexts
have been deactivated. These are not reported separately.
+CGEV: ME DETACH
The mobile equipment has forced a Packet Domain detach. This implies that all active
contexts have been deactivated. These are not reported separately.
+CGEV: NW CLASS
The network has forced a change of MS class. The highest available class is reported
(see AT+CGCLASS).
+CGEV: ME CLASS
The mobile equipment has forced a change of MS class. The highest available class is
reported (see AT+CGCLASS).
Examples
SIM7500_SIM7600 Series_AT Command Manual_V1.07
1 or 2 is entered (OK response shall be given before flushing the codes).
<PDP_addr>
<class>
<class>
Smart Machine Smart Decision
223 2017-12-25