Data Sheet

Smart Machine Smart Decision
TA controls the supplementary services Call Hold, Multiparty and Explicit
Call Transfer. Calls can be put on hold, recovered, released, added to
conversation, and transferred.
Note These supplementary services are only applicable to tele service 11
(Speech: Telephony).
OK
If error is related to ME functionality:
+CME ERROR: <err>
AT+CHLD=<n>
Parameters
<n> 0 Releases all held calls or sets User Determined User Busy
(UDUB) for a waiting call
1 Releases all active calls (if any exist) and accepts the other
(held or waiting) call.
1x Releases a specific call x
2 Place all active calls on hold (if any) and accept the other
(held or waiting) call.
2x Places all active calls on hold except call X with which
communication shall be supported.
3 Adds a held call to the conversation.
4 Connects the two calls and disconnects the subscriber from
both calls(ECT)
Parameter Saving NO_SAVE
Mode
Max Response 20s
Time
Reference Note
3.2.15 AT+CIMI Request International Mobile Subscriber Identity
AT+CIMI Request International Mobile Subscriber Identity
Test Command Response
AT+CIMI=? OK
Response
TA returns <IMSI>for identifying the individual SIM which is attached to
ME.
<IMSI>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Execution
Command
AT+CIMI
Parameters
SIM800 Series_AT Command Manual_V1.05 70 2014-07-31