Siemens MC55 - Manual (Page 142)

MC55 AT Command Set
7.3 ATD
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obile
MC55_ATC_V01.05 Page 142 of 469 2/10/04
Confidential / Released
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
Dialing out the first party's number.
OK
The first call is established.
ATD03022222222
The number of the second party is dialed.
OK
The response "OK" is issued immediately though no call is established
(same behavior as is you had chosen
AT^SM20
=0.)
BUSY
Line of the second called party is busy.