<err> Description

0

Phone failure

3Operation not allowed

4Operation not supported

21

Invalid index

30No network service

31Network timeout

100Unknown

Unsolicited Result Codes:

+CCWA: <number>, <type>, <class>

16.13AT+CHLDCall Hold and Multiparty

Description

Command

Possible Responses

Request call related

AT+CHLD=<n>

supplementary services

 

Show if the command is AT+CHLD=? supported

•_ +CME ERROR <err>

•_ OK

•_ ERROR

•_ +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

Owner’s Manual

Rev 1.0

Page 264 of 264