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Topex VoIP GSM gateway

Tested with:
Gigaset T300/T500 PRO: Software version
Mobilink IP Firmware version: Mobilink-IP-1.2.10-C1P-SDX

In this example we started with a default Mobilink Gateway where we added a SIM card and disabled the SIM PIN code as described in the Mobilink manual.


Settings in the Mobilink VoIP GSM Gateway

Go to: Network - IP settings

The Device should have a fixed IP address.
Settings are dependent of the customers network.


Go to: VoIP - Codec Settings


Go to: VoIP - DTMF Settings

Change the DTMF Setting to RFC2833


Go to: VoIP - Voice Settings

Gain can be adjusted dependent on the customers request


Go to: Call Control - Settings

Change the PBX IP address to the IP address of your Gigaset T300/T500


Go to: Call Control - Incoming Calls

Change the settings Target, this number is dialled when a GSM call is coming in. In the Gigaset T300/T500, this is the external number that is configured and given to a user or a group.

Go to: Call Control - Outgoing Calls


Go to: Local Users - SIP Users









No ringing during setup outgoing call

Extra, you need to set the option:

Menu - > Call Control -> Parameters -> Add the parameter: tx_progress 0

This will change that de device will not send the ringing signal through early media but using 180 Ringing.


Settings in the Gigaset T300/T500


Go to: Configuration - Lines and Add a new line.

Authentication: Yes
User Name: like defined in the Mobilink Gateway Local Users - Sip users
Password: like defined in the Mobilink Gateway Local Users - Sip users

Provider: Create a new provider.


Use the above settings.

host: IP address of the Mobilink VoIP GSM gateway


Add here the same number as defined in the Mobilink Gateway Call Control - Incoming Calls


Change the Max Connection: to match the number of GSM channels in the Mobilink Gateway, in this example we only had one channel.
We also added a Line Prefix for testing purposes.




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