Iridium Communications, Inc. Information Contained in this Guide
Iridium 9523 Product Developers’ Guide is Subject to Change Without Notice
Revision 2.6
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Note: While this command is implemented in the Iridium 9523, it may not yet be supported in the Iridium
network. Stand by for an Iridium Technical Bulletin announcing network support for this feature.
This command is based on GSM 07.07 [2] subclause 7.12, and is used to invoke the HOLD and MPTY
supplementary services for switching between held calls, etc. The values of <n> are the same as those
that a user can enter via a numeric keypad, as described in GSM 02.30 [5] subclause 4.5.5.
This command is not abortable, and finishes without waiting for a response from the network. The
interaction of this command with other commands based on other GSM supplementary services is
described in the GSM standard.
The following parameter values are currently supported:
<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 active call X
“2” Places all active calls (if any exist) on hold and accepts 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” Not supported (Connects the two calls and disconnects the subscriber from both calls
(ECT))
“4*dirno” Not supported (Redirect an incoming or a waiting call to the specified directory number)
“5” Not supported ($(CCBS)$: Activates the Completion of Calls to Busy Subscriber
Request)
Test Command: +CHLD=?
Test command returns the <n> values supported by the phone. The response is in the form:
+CHLD:(list of supported <n>s)
Note: “AT+CHLD=0” can be used to set UDUB when there is an incoming call, whether or not there is a
current call active (or held), in order to support GSM 02.30 [5] subclauses 4.4.2.3 and 4.5.5.2.
5.7.121 +XCSI – Extended Call State Information
This proprietary unsolicited announcement was added to allow the FA to keep track of call state during
Call Hold and Multiparty operations using AT+CHLD.
Exec Command: none
Unsolicited Announcement:
+XCSI=<overall call_state>,<active call_state>,<held_call state>,<active index>,<held index>
where:
<overall call_state>:
0 Idle (dialling possible)
1 One single-party call active
2 One multiparty call active
3 Incoming call arriving (otherwise idle)
4 One single-party call active, plus waiting call
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