Specifications

HE863 family AT commands reference guide
80377ST10083a Rev.4 – 2012-02-01
Reproduction forbidden without written authorization from Telit Communications S.p.A.- All Rights Reserved. Page 63 of 228
+CHLD - Call Holding Services
1X - release a specific call (x specific call number as indicated by +CCLC)
2 - place all active calls (if exist) on hold and accepts the other call (held or
waiting). If only one call exists which is active, place it on hold and if only
held call exists make it active call
2X - place all active calls on hold except call x with which communication is
supported
3 - adds a held call to the conversation
4 - connects the two calls and disconnects the subscriber from both calls
(Explicit Call Transfer)(ECT).
6 - puts an active call on hold or an held call to active, while another call is
waiting
7 - disconnect users in multiparty without accepting incoming call
8 - release all calls
AT+CHLD=?
Test command returns the list of supported <n>s.
+CHLD: (0,1,1X,2,2X,3)
Reference 3GPP TS 27.007
Note ONLY for VOICE calls
3.5.3.3.13. Unstructured Supplementary Service Data - +CUSD
+CUSD - Unstructured Supplementary Service Data
AT+CUSD=
[<n>[,<str>
[,<dcs>]]]
Set command allows control of the Unstructured Supplementary Service Data
(USSD [3GPP TS 02.90/22.090]).
Parameters:
<n> - is used to disable/enable the presentation of an unsolicited result code.
0 - disable the result code presentation in the DTA
1 - enable the result code presentation in the DTA
2 - cancel an ongoing USSD session (not applicable to read command
response)
<str> - string type USSD-string (when <str> parameter is not given, network is
not interrogated)
<dcs> - indicates Cell Broadcast Data Coding Scheme. Its default value is 0.
Note: the unsolicited result code enabled by parameter <n> is in the format:
+CUSD: <m>[,<str>,<dcs>] to the TE
where:
<m>:
0 - no further user action required (network initiated USSD-Notify, or no further
information needed after mobile initiated operation).
1 - further user action required (network initiated USSD-Request, or further
information needed after mobile initiated operation)
2 - USSD terminated by the network
3 - other local client has responded
4 - operation not supported