Topex VoIP GSM gateway
Tested with:
Gigaset T300/T500 PRO: Software version 4.6.5.3
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.
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Go to: VoIP - Codec Settings |
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Go to: VoIP - DTMF Settings
Change the DTMF Setting to RFC2833
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Go to: VoIP - Voice Settings Gain can be adjusted dependent on the customers request |
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Go to: Call Control - Settings
Change the PBX IP address to the IP address of your Gigaset T300/T500 |
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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 |
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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. | 
