Siemens MC55 Command Set page 142

MC55 AT Command Set
7.3 ATD
Example
The following example shows the call setup procedure when a call is already active and a second call attempt
fails because the line of the called party is busy:
atd03012345678
OK
ATD03022222222
OK
BUSY
MC55_ATC_V01.05
Confidential / Released
Dialing out the first party's number.
The first call is established.
The number of the second party is dialed.
The response "OK" is issued immediately though no call is established
(same behavior as is you had chosen
Line of the second called party is busy.
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2/10/04