Siemens MC35 manual 16 AT+CHLD Call hold and multiparty, At+Cgsn=?, Sn OK, At+Chld=?

AT Command Set

4.15AT+CGSN Request product serial number identification (IMEI) identical to GSN

Test command	Response
AT+CGSN=?	OK
Execute command	Response
AT+CGSN	TA returns identification text for determination of the individual ME.
	<sn> OK
	Parameter
	<sn> IMEI of the telephone (International Mobile station Equipment Identity)
Reference	Note
GSM 07.07	See also ”AT+GSN Request TA serial number identification”.

4.16 AT+CHLD Call hold and multiparty

Test command	Response
AT+CHLD=?	+CHLD: (list of supported <n>s)
	OK
Execute command	Response
AT+CHLD=[<n>]	TA controls the supplementary services Call Hold, MultiParty and Explicit Call
	Transfer. Calls can be put on hold, recovered, released, added to conversation
	and transferred.
	Note: Supplementary services are only applicable to teleservice 11 (Speech tele-
	phony).
	OK
	If error is related to ME functionality:
	+CME ERROR: <err>
	Parameter
	<n>	0	Terminate all held calls; or set UDUB (User Determined User
			Busy) for a waiting call, i.e. reject the waiting call.
		1	Terminate all active calls (if any) and accept the other call
			(waiting call or held call)
		1X	Terminate the active call X (X= 1-7)
		2	Place all active calls on hold (if any) and accept the other call
			(waiting call or held call) as the active call
		2X	Place all active calls except call X (X= 1-7) on hold
		3	Add the held call to the active calls

Reference

GSM 07.07

Note

•In conflicting situations, e.g. when a waiting call comes while there are already held calls, the above procedures apply to the waiting call only. For example, <n>=0 rejects the waiting call, but does not affect the held calls.

•While the PDP context for GPRS is activated it is recommended to terminate any calls with AT+CHLD=1 rather than usind ATH. This is significant because ATH would also cancel an active PDP context. See also Chapters 2.12 and 6.3.2.

MC35_ATC_01_V04.00 Page 74 of 238 02.04.2002