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

MC55 AT Command Set

9.8 AT+CHLD

s

mobile

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>

PIN ASC0 ASC1 MUX1 MUX2 MUX3

￿ ￿ ￿ ￿ ￿ ￿

Reference(s)

GSM 07.07

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.

MC55_ATC_V01.05	Page 230 of 469	2/10/04
Confidential / Released