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SIM800 Series_AT Command Manual_V1.09

2015-08-03

Parameters

See Write Command

Response

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).

If error is related to ME functionality:

+CME ERROR: <err>

Write Command

AT+CHLD=<n>

Parameters

<n>

Releases all held calls or sets User Determined User Busy

(UDUB) for a waiting call

Releases all active calls (if any exist) and accepts the other

(held or waiting) call.

Releases a specific call x

Place all active calls on hold (if any) and accept the other

(held or waiting) call.

Places all active calls on hold except call X with which

communication shall be supported.

Adds a held call to the conversation.

Connects the two calls and disconnects the subscriber from

both calls(ECT)

Parameter Saving

Mode

NO_SAVE

Max

Response

Time

20s

Reference

Note

3.2.15 AT+CIMI

Request International Mobile Subscriber Identity

AT+CIMI

Request International Mobile Subscriber Identity

Test Command

AT+CIMI=?

Response

Execution

Command

AT+CIMI

Response

TA returns <IMSI>for identifying the individual SIM which is attached to

ME.

<IMSI>

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