Specifications

ISU AT Command Reference Phase VII AT Commands
Iridium Proprietary Version 2.45
20 June 2011 99
12 One multiparty call held, plus waiting call
13 Dual single-party call (one active, one held), plus waiting call
14 Dual call: single party call held, multiparty call active, plus waiting call
15 Dual call: single party call active, multiparty call held, plus waiting call
16 Busy, i.e. one or more calls are waiting for the network to process a change
<active call_state>, <held call state>:
0 Call is idle
1 MO establishment in progress
2 Waiting for user to answer MT call
3 User accepted MT call, completing establishment
4 Fully active
5 Call is part of fully active multiparty call
6 Call held
7 Call is part of held multiparty call
8 Multiparty (conference) build requested
9 Hold requested
10 Multiparty hold requested
11 Retrieve requested
12 Multiparty retrieve requested
13 Call is being removed (split) from multiparty call
14 Reestablishing
15 Releasing
<active index>,<held index>:
0..5 Index of call record
255 No call record
The +XCSI message extends the information available in the +DPLCI announcement. It will be sent
whenever there is a non-data call state change in the DCE’s internal Call Control (MMICC) state machines,
including during a voice call session (possibly with multiple concurrent calls) when any call become
held/active/waiting. There will be no +XCSI announcements during a data call, but there could be one after
the data call has finished, when the overall call state goes idle.
The coding of the call states is a direct reflection of the TD_MMICC_OVERALL_C_S and
TD_MMICC_CALL_STATE (or MMICC_SM_STATE) values in the DCE source code.
The call index fields identify the call records for the active and held calls. Note that the DCE
implementation allows at most one held call at a time. The index values can be used in the “<1x>” and
“<2x>” options of the AT+CHLD command.
This message is used internally to the 9555 Handset, and is not intended for use by end users. This
notification is not available on the 9522B LBT.