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In the Gigaset PBX go to "Configuration" - "Lines" - "Lines" and click on: New Line
Give the Line an unique name, insert the Registration user name and Password.
In the Provider pull-down list, select "new.."
Just add the telephone numbers for this SIP trunk. The Country Code and Area Code can be filled in, if different than the default setting.
To enable A number forwarding, you need to activate the No Screening feature.
No Screening: The feature CLIP No Screening enables an alternative number to be sent and displayed to the call recipient on outgoing calls.
Phone Number Prefix: If No Screening is activated, the Gigaset T500/300 PRO may have to be changed to match the service provider's specification regarding the phone number format of the dialling code.