DECT Settings → DECT Encryption, early Encryption and re-keying is disabled to support transparent repeater operation. 
Telephony → Audio → Wideband Support must stay deactivated to support transparent repeater operation: 
With a handset you could check the RPN in the RFP-Scan procedureOpen the dial window via long-press SEND button. 
If your repeater is registered, you would see one or multiple results (depends on number of registered repeaters within DECT range). Examples 1: One repeater is registered: - N610: RPN ends with '1' or '9'
- Repeater: RPN ends with "2..7' or 'a..f'
2: Repeater support is deactivated - N610: RPN ends with '0' or '8'
FPN=a6 RPN=00 RSSI=38
3: Repeater support is activated - N610: RPN ends with '1' or '9'
FPN=a6 RPN=01 RSSI=38
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