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18. SUPPLEMENTARY SERVICES
323
LZT 123 7263 R1C
Example
AT+CCWA=?
+CCWA: (0-1)
OK
AT+CCWA?
+CCWA: 0
OK
18.13 AT+CHLD Call Hold and Multiparty
This command allows control of the following call related services:
• a call can be temporarily disconnected from the ME but the
connection is retained by the network;
• multiparty conversation (conference calls);
• the served subscriber who has two calls (one held and the other
either active or alerting) can connect the other parties and release the
served subscriber's own connection.
Calls can be put on hold, recovered, released, added to conversation,
and transferred similarly as defined in 3GPP TS 22.030.
This is based on the GSM/UMTS supplementary services HOLD (Call
Hold; refer 3GPP TS 22.083 clause 2), MPTY (MultiParty; refer 3GPP
TS 22.084) and ECT (Explicit Call Transfer; refer 3GPP TS 22.091).
The interaction of this command with other commands based on other
GSM/UMTS supplementary services is described in the GSM/UMTS
standards.
Note! Call Hold and MultiParty are only applicable to teleservice 11.
Description Command Possible Responses
Request call related
supplementary
services
AT+CHLD=<n> • +CME ERROR <err>
•OK
•ERROR
Show if the command
is supported
AT+CHLD=? • +CHLD: (list of
supported <n>s)
• +CME ERROR <err>
•OK
•ERROR