Quectel EC25 Command Manual page 92

Parameter
<n> String of dialing digits and optionally V.25ter modifiers
Dialing digits: 0-9, * , #, +, A, B, C
Following V.25ter modifiers are ignored: ,(comma), T, P, !, W, @
<mgsm> String of GSM modifiers:
I
i
G
g
<;> Only required to set up voice call, return to command mode
NOTES
1. This command may be aborted generally by receiving an ATH command or a character during
execution. The aborting is not possible during some states of connection establishment such as
handshaking.
Parameter "I" and "i" can be omitted only when there is no "*" or "#" code within the dial string.
2.
3. See ATX command for setting result code and call monitoring parameters
4. Responses returned after dialing with ATD
For voice call, two different responses mode can be determined. TA returns "OK" immediately either
after dialing was completed or after the call was established. The setting is controlled by AT+COLP.
Factory default is AT+COLP=0, which causes the TA to return "OK" immediately after dialing was
completed. Otherwise TA will return "OK", "BUSY", "NO DIAL TONE", or "NO CARRIER".
5. Using ATD during an active voice call:

When a user originates a second voice call while there is already an active voice call, the first
call will be automatically put on hold.

The current states of all calls can be easily checked at any time by using AT+CLCC command.
Example
ATD10086;
OK
EC25&EC21_AT_Commands_Manual
Actives CLIR (Disable presentation of own number to called party)
Deactivates CLIR (Enable presentation of own number to called party)
Activates closed user group invocation for this call only
Deactivates closed user group invocation for this call only
//Dialing out the party‟s number
LTE Module Series
EC25&EC21 AT Commands Manual
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