Precondition: users are configured and ISDN Point-to-Point trunk is up and running. Menu: Assistants - PBX - Trunks: press edit Button 
Configuration of ISDN main number and DDI exceptions. Menu: Assistants - PBX - Trunks: edit ISDN trunk data Main trunk number format must be the same as sent from provider 
Configuration of user basic settings for used ISDN trunk. Menu: Assistants - PBX - Users: press edit Button 
Configuration of user basic settings for used ISDN trunk. Menu: Assistants - PBX - Trunks: edit user basic settings

Overview of trunk configuration. Menu: Numbering - Trunk settings - Trunk Numbering: press edit button 
Overview of trunk configuration. Menu: Numbering - Trunk settings - Trunk Numbering: edit ISDN trunk basic data 
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