Setting up a GSM gateway is really simple: What you need is a router with an integrated modem, e.g. a FRITZ!Box 7170, a (secondary) SIM card of a mobile network provider of your choice and a GSM fixed wireless terminal, e.g. a Sagem / Vodafone RL 500 (products can be found in miShopping) . That’s all! OK, you need some cables, too. But that’s indeed everything you need.
But how does a GSM gateway work? And for what is it useful?
That’s really simple. Calling a cell phone from your fixed line network is very often more expensive than calling it by another cell phone or via VOIP. To install VOIP to a FRITZ!Box 7170 is not very tricky, an ‘how to’ can be found on https://miapple.me.
Some mobile network providers have special offers for secondary, family or partner SIM cards. Some cable TV providers like Kabel Deutschland (Kabel Phone) offer mobile network services, too, with up to 5 SIM cards which can call each other for free (In the case of Kabel Deutschland you get the o2-network.)! And that’s what you need!
This means that you can make a call from your fixed phone at home via the GSM gateway to your associated SIM cards for free!
In the following the instructions for setting up your GSM gateway:
1. Vodafone RL 500
A detailed description of the RL 500 can be found in the instruction leaflet. For setting up the GSM Gateway you need parts 2,3,8 and 9. Part 9 is the ‘white adaptor’ in the following. In addition, parts 6 and 7 is the external antenna for extra range.
2. FRITZ!Box 7170:
The FRITZ!Box 7170 manual can be download at the avm homepage.
The following is included in the FRITZ!Box Fon WLAN 7170 package (needed things for the GSM-Gateway in bold):
- FRITZ!Box Fon WLAN 7170
- one AC power adapter with cable for connection to the power mains
- one 4.25-m combined DSL-telephone cable (gray/black) for connecting FRITZ!Box to the DSL splitter and the ISDN network terminator (NT) or the analog telephone line (“Y-cable”)
- one network cable (red) for connecting FRITZ!Box to a computer or network hub
- one RJ45-RJ11 adapter (gray) for the DSL line (required in some countries)
- one RJ45-RJ11 adapter (black) for connecting FRITZ!Box Fon WLAN 7170 to the analog telephone network (“black adaptor”)
- one FRITZ!Box CD with Installation Help, DSL software FRITZ!DSL, software for the printer port, documentation for all enclosed AVM components
- printed quick guide
3. Installation of the hardware:
4. Installation of the software:
If your FRITZ!Boxhas a direct connection to the internet, go to http://fritz.box/ to open the user interface. If not, e.g. in the case of a cable network provider like Kabel Deutschland, you have to go to the distinguished IP address of your FRITZ!Box. In my case it is a FRITZ!Box 7170 with the IP address http://192.168.123.456/.
‘0000000000’ means calling via the GSM Gateway:
After that you should establish ‘dialing rules’. For example, I defined four dialing rules:
- All long distance calls outside germany via VOIP.
- All cell phone calls via VOIP.
- The dedicated cell phone number via ‘0000000000’.
- Another dedicated cell phone number via ‘0000000000’.
To set up a dialing rule:
- Select the “Settings” menu.
- Click the “Dialing Rules” command in the “Telephony” menu.
- On the “Dialing Rules” page you can define the kind of connection for ranges of numbers. All connections to number ranges for which a dialing rule has been defined are established using the specified connection type.
- Click the “New Dialing Rule” button to define as many dialing rules as desired.
- Click the “Apply” button.
That’s all! Yes, you did it!
Alternatively, the FRITZ!Box 7270 and 7390 have the capability to install directly a USB stick. On the one hand it is easier to set up, but in many households the router is not at the optimum place in respect to get the best reception. In these cases a RL 500 is the better option because of the extra external antenna.
Stay tuned! 😉