When you use the R630 behind the N720 and you are missing features like Call-list / Telephone book / Message Waiting, then it could be that the R630 is not recognised as an PRO handset and to solve this you can upload this config file.

1) with supporting base stations or gateways

Compatibility

• Full compatibility with Gigaset N720 DECT IP multicell system ( >= Version 100) and N510 IP PRO base station (>= Version 238)
• In GAP mode behind 3rd party DECT multicell systems: local missed calls list, edit base name, set time & date by base