Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 513)

Supplementary Services Commands
Call Related Supplementary Services +CHLD
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
20.2 Call Related Supplementary Services +CHLD
20.2.1 Description
This command is used to manage call hold and multiparty conversation (conference
call). Calls can be put on hold, recovered, released or added to a conversation.
Call hold and multiparty are only applicable to teleservice 11 (speech telephony).
20.2.2 Syntax
Action command
AT+CHLD=<n>
OK
Read command
AT+CHLD?
OK
Test command
AT+CHLD=?
+CHLD: (list of supported <n>s)
OK