Siemens MC55 AT manual AT+CHLD Call Hold and Multiparty, At+Chld=?, AT+CHLD=n, Udub

9.8AT+CHLD Call Hold and Multiparty

Syntax

Test Command

AT+CHLD=?

Response(s)

+CHLD: (list of supported <n>s)

OK

Write Command

AT+CHLD=[<n>]

Response(s)

OK ERROR

+CME ERROR: <err>

Reference(s)

GSM 07.07

PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last

% % % % % % ! ! !

Command Description

TA controls the Supplementary Services Call Hold and Multiparty. Calls can be put on hold, recovered, released, and added to a conversation.

Like for all Supplementary Services, the availability and detailed functionality of Call Hold and Multiparty services depends on the configuration of the GSM network. The MC55 can only request the service, but the network decides whether and how the request will be answered.

Parameter Description

<n>(num)

0		Release all held calls or set User Determined User Busy (UDUB) for a waiting
		call:
		• If a call is waiting, release the waiting call. The calling party will receive a
		"BUSY" indication (Supplementary Service User Determined User Busy
		"UDUB")
		• Otherwise, terminate all held calls (if any).
1		Terminate all active calls (if any) and accept "the other call" as the active call:
		• If a call is waiting, the waiting call will be accepted.
		• Otherwise, if a held call is present, the held call becomes active.
	1X	Terminate a specific call X (X= 1-7). The call may be active, held or waiting.
		The remote party of the terminated call will receive a "NO CARRIER" indica-
		tion. Parameter X is the call number <idx> of the targeted call in the list of cur-
		rent calls available with AT command AT+CLCC.
2		Place all active calls on hold (if any) and accept "the other call" as the active
		call:
		• If a call is waiting, the waiting call will be accepted.
		• Otherwise, if a held call is present, the held call becomes active.
	2X	Place all active calls except call X (X= 1-7) on hold. Parameter X is the call
		number <idx> of the targeted call in the list of current calls available with AT
		command AT+CLCC.
3		Add a held call to the active calls in order to set up a conference (multiparty)
		call.
MC55_ATC_V04.00		Page 206 of 475	3/17/06
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