Call forwarding using AT commands and a USB modem (Huawei E160) - GSM-Forum

Leopold1966 · 03-25-2013, 11:39

Hi, I would like to use an old USB modem (Huawei E160) and AT-commands to automate call forwarding (based on a timer logic) from a mobile number to 2 others.
There is a Gsm code available ("**21*number#") which switches the number from here to there. If I dial this number with a mobile all works well and the number is switched accordingly.
If I put the Sim card into the USB modem and use AT-commands it doesn't work, although the modem always gives back an "OK". I use hterm to test this.
The AT-commands I've tested with is:
"ATD**21*+436641234567#;"
"ATDT**21*+436641234567#;"
The modem is voice enabled. A test call to my private mobile using "ATD+436641234444;" works well and my phone rings.
Has anybody had this problem before and found a solution? Thanks in advance, Leo

Leopold1966 · 03-29-2013, 08:25

Due to the lack of doc it turned out to be useless to find the right syntax for the AT commands. I use Software "gammu" now which works well on my RaspberryPi to establish a call diversion.

vve · 03-29-2013, 16:25

Data sets like "*some_stuff#" are not phone numbers but USSD commands. That's why ATD command doesn't work for this.
You can use AT+CUSD command to send USSD. Google for tutorial - it's standard GSM command.
For Huawei modems, it's often required to select a correct USSD processing mode (data coding scheme) with AT^USSDMODE command before you send.
So, the sample command sequence to send "*100#" command should look like this:

Code:

AT^USSDMODE=0
AT+CUSD=1,"*100#",15

Note that you can run this sequence on either PC UI or modem port, but answer (if any) will arive to PC UI regardless of initial port choice.

03-25-2013, 11:39	#1 (permalink)
Leopold1966 Junior Member Join Date: Mar 2013 Posts: 2 Member: 1906439 Status: Offline Thanks Meter: 0	Call forwarding using AT commands and a USB modem (Huawei E160) Hi, I would like to use an old USB modem (Huawei E160) and AT-commands to automate call forwarding (based on a timer logic) from a mobile number to 2 others. There is a Gsm code available ("*21number#") which switches the number from here to there. If I dial this number with a mobile all works well and the number is switched accordingly. If I put the Sim card into the USB modem and use AT-commands it doesn't work, although the modem always gives back an "OK". I use hterm to test this. The AT-commands I've tested with is: "ATD*21+436641234567#;" "ATDT*21+436641234567#;" The modem is voice enabled. A test call to my private mobile using "ATD+436641234444;" works well and my phone rings. Has anybody had this problem before and found a solution? Thanks in advance, Leo

03-29-2013, 16:25	#3 (permalink)
vve Freak Poster Join Date: Mar 2002 Location: Moscow, Russia Age: 53 Posts: 219 Member: 10397 Status: Offline Thanks Meter: 45	Data sets like "some_stuff#" are not phone numbers but USSD commands. That's why ATD command doesn't work for this. You can use AT+CUSD command to send USSD. Google for tutorial - it's standard GSM command. For Huawei modems, it's often required to select a correct USSD processing mode (data coding scheme) with AT^USSDMODE command before you send. So, the sample command sequence to send "100#" command should look like this: Code: AT^USSDMODE=0 AT+CUSD=1,"*100#",15 Note that you can run this sequence on either PC UI or modem port, but answer (if any) will arive to PC UI regardless of initial port choice.

03-29-2013, 08:25	#2 (permalink)
Leopold1966 Junior Member Join Date: Mar 2013 Posts: 2 Member: 1906439 Status: Offline Thanks Meter: 0	Due to the lack of doc it turned out to be useless to find the right syntax for the AT commands. I use Software "gammu" now which works well on my RaspberryPi to establish a call diversion.