How to transfer calls from SIM card to another phone number
using a Sierra Fastrack GSM modem
Please follow the guide below to be able to transfer incoming
calls from a given SIM card to another telephone number when you use Sierra
Wireless Fastrack Xtend GSM modem.
Why to transfer calls
Transferring refers to redirecting incoming calls from the SIM
card to an other phone number.
Transferring of incoming calls can be useful when there is an incoming call to
the GSM modem while SMS messages are also being sent. In these cases the message
sending process can be interrupted by the phone call or the message sending is
You can avoid these cases by transferring these incoming phone calls to an other
telephone number. In this way, calls arriving to the given SIM card will be
forwarded to the other phone number.
For transferring calls from the GSM modem you will need Hyperterminal. Please note
that Hyperterminal is included in Windows XP or older operating systems but if
you use newer operating system than Windows XP you need to download Hyperterminal.
It is assumed that Hyperterminal has already been downloaded
and installed on your PC.
First of all, start Hyperterminal (Figure 1).
Create a new connection in Hyperterminal and provide a name for
the new connection and click OK (Figure 2).
Select the port to which the GSM modem is connected in
Connect using field. Then click on Configure button to configure
the the port (Figure 3).
Set Bits per second field to 115200 and click on OK (Figure 4).
In the next window just click on OK (Figure 5).
You can test the connection by using an AT command. If OK
is returned then the connection is successful and communication with the modem
is possible (Figure 6).
Now you can issue the call-forwarding command: AT+CCFC=0,3,"telephone number"
For example: AT+CCFC=0,3,"+36301234567".
Please note that in this command you always need to give the telephone number in
international format (with + sign) and between quotation marks ("")
You can issue this command as follows:
1: Mobile busy
2: No reply
3: Not reachable
4: All call forwarding
5: All conditional call forwarding
After issuing this command phone calls arriving for this SIM card will be
forwarded to the specified phone number (in this example, to +36301234567
telephone number) (Figure 7).
If you do not need call forwarding anymore (for example you wish
to use the given SIM card in mobile phone and not in the modem) you need to
issue the following command to disable call forwarding:
AT+CCFC=0,4 (Figure 8).
If you follow the steps of this guide you will be able to avoid
inconvenient cases when SMS sending process is slow down or interrupted because
of an incoming call. In case the call forward is not required anymore you can
easily disable it.