The telecom engineer of my DSL connection should take in our new building in operation, got by me this box. Conclusion: Two times tried the telephone cable wires fixed to screw, 2x the small wires "pulled the trigger" when tightening. No, I have not screwed. The telecom engineer who makes the day-every day. His comment: "These 'Baumarkt-doses the quality is always the same: bad You never know how good the wire is placed and whether one thereby gets interference.."
Conclusion: can was launched in the "round tray" and the Telekom technician has used a decent box out of his range (brand "Telekom") with LSA terminals. Also has a penny cost (except for the bad buy).