Sony Ericsson TT4031 (SE-GM29) - Manual (Page 264)

Owner’s Manual Rev 1.0 Page 264 of 264
<err> Description
0 Phone failure
3 Operation not allowed
4 Operation not supported
21 Invalid index
30 No network service
31 Network timeout
100 Unknown
Unsolicited Result Codes:
+CCWA: <number>, <type>, <class>
16.13 AT+CHLD Call Hold and Multiparty
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
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