Siemens MC55 AT manual At+ccwa=1,1,1, +CCWA +491791292364,145,32,,0, At+chld=2, Hello, At+clcc

Notes

•The AT+CHLD command offers a broad range of options according to the GSM specifications. However, if you attempt to invoke an option which is not provisioned by the network, or not subscribed to, invocation of this option will fail. The responses in these cases may vary with the network (for example "Operation not allowed", "Operation not supported" etc.).

•The handling of the supplementary service Call hold and Multiparty varies with the types of calls. This is because only voice calls can be put on hold, while data or fax calls cannot. The following procedures apply: With AT+CHLD=2 the user can simultaneously place a voice call on hold and accept another waiting voice, data or fax call. If the waiting call is a data or fax call, it is also possible to put the voice call on hold. To switch back from the active data or fax call to the held voice call the active call must be terminated with AT+CHLD=1. If all active and held calls are voice calls it is possible to switch back and forth with AT+CHLD=2.

•In conflict 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.

•See also the AT+CCWA command for details on how to display waiting calls.

Example

^SYSSTART

at+cpin="9999"

OK

+CREG: 2
	The mobile is now registered.
+CREG: 1,"0145","0016"
at+ccwa=1,1,1	You activate the indication of waiting calls during
	voice calls.
OK	You make a voice call.
atd"1234567";
OK	You receive a URC indicating a waiting data call.
+CCWA: "+491791292364",145,32,,0
at+chld=2	You put the voice call on hold.
CONNECT 9600/RLP	The data connection is set up.
hello	With ''+++'' you go in command mode.
+++
OK	You interrogate the status of all established calls.
at+clcc
+CLCC: 1,0,1,0,0,"03038639268",129
+CLCC: 2,1,0,1,0,"+491791292364",145
OK	The active data call is terminated and the held voice
at+chld=1
	call becomes active.
OK
at+clcc
+CLCC: 1,0,0,0,0,"03038639268",129
OK

MC55_ATC_V04.00	Page 207 of 475	3/17/06
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