Specifications

Chapter 9 – Call Control Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide 35
Dial Command D
Description: The ATD command is used to originate a voice or data call. For a data call, the application sends
the following ASCII string to the product:
ATD<nb>
where <nb> is the destination phone number.
Note: ATD<nb> is followed by PPP session startup and negotiation. Standard PPP
packets are HDLC formatted. A packet data call is terminated by de-assertion of
the DTR signal to the modem. See the AT&D command.
Command is not valid for Multi-Tech UIP devices when in a AT+WOPEN=1 state.
For a voice call, the application sends the following ASCII string to the product:
ATD<nb>;
where <nb> is the dialing string or destination phone number, followed by a
semicolon
“;”. The dialing string may contain characters “0-9”,”#”,”*” only.
Note that some countries may have specific numbering rules for their CDMA handset
numbering.
If a call, voice or data, is already in progress, initiating a dial will return an ERROR.
The dial sequence is responsible for handling emergency calls. It is the host application's
responsibility to tear down a data call if an outgoing emergency call has been initiated.
The response to the ATD command is one of the following:
Verbose Result
Code
Numeric Code
(with ATV0 set)
Description
OK
0
Command executed (voice)
ERROR
Call already in progress
CONNECT
<speed>
10,11,12,13,14,1
5
If the call succeeds, for data calls only, <speed> takes
the value negotiated by the product
BUSY
7
If the called party is already in communication
NO ANSWER
8
If no hang up is detected after a fixed network time-out
NO CARRIER
3
Call setup failed or remote user release
NO DIALTONE
6
Voice call with missing “;”