Modem Simulator

This Wiki Page describes how to use a NetModule Wireless Router as replacement for legacy dial in / dial out connections based on analog or gsm modems.

We support the Hayes AT Command set on the serial interface and behave like normal router

You can easily replace your old Modem with an the NetModule Router. There is also no need to configure the attached device as you can prepare the NetModule Router accordanly.

• NetModule Wireless Router with a Serial Interface (integrated or as an extension)
• NRSW 4.1.0.100 or newer

The Modem Emulator will only replace the AT Command Set on the serial side. The Communication between the NB1600 and another Endpoint will be done as a transparent tcp Connection.

This way you can provide the old legacy functanality over modern IP Connections. Depending on your infrastracture you could secure your communication with a VPN Layer or work straight with Public IP Adresses.

An important Part on the Dial-In/Dial-Out Installations is the addressing of the Endpoints. The old addressing concept were based on phone numbers. With the Modem Emulator the Adresses will switch on an ip-address/port based addressing.

But for backward compatibiliy we integrated a Phonebook Feature, so that you can keep the old phone-number based addresseing and we woll resolv them into ip-address/ports.

The Serial Interface need to be configured in the mode “modem emulator”. The option can be found in Interfaces→Serial→Edit. After you applied the mode “modem emulator” you will find the detailed options.

Please set the Baud Rate accordingly to you attached device. Also set the “Hardware flow control to your needs. Any further configuration of the serial interface can be done via the hayes command set.

Any incoming connection will be received on the Port configured. This Port need also to be accessible on the IP Adress to you like to reach the Modem Emulator from the Outside. Keep this in mind for any Firewall configurations.

The Phonebook section of the configuration will keep the aliases of any Phonenumbers so that you don't need to reconfigure you device and can use the old adressing scheme.

The new dial command would be:

atdt dialserver.de:2000
atdt 10.8.4.1:2000

But with the Phonebook Feature you can keep your old dial commands

atdt 069123546 

To move from your old dial in connection infrastructure into the new IP World with the Modem Emulator you would need to perform following steps.

• Configure a OpenVPN Network to reach every Router in the Field. You can use a Netmodule Wireless Router as a OpenVPN Server
• Enable the