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In the Gigaset PBX go to "Configuration" - "Lines" - "Lines" and click on: New Line
Assign a name to the new line. On authentication choose no, as upc cablecom authenticates on the assigned IP-address
Choose "new" in the field Provider
Fill the settings as shown below. The Host-IP is provided by upc cablecom.
Enter the phone numbers for your SIP trunk
Click on apply and save
UPC Cablecom SIP-Trunk Setup.pdf