Question about Panasonic KX-TG 6721 GB

Would like to store and listen to voicemails on the Panasonic Tel base station, not from the server. Is this tel compatible with the Sunrise Internet Box (fibre connection)? Internet Box supports DECT and Cat 2.2 as well as a supposedly analogue Tel connection. However, TelSignal runs via fibre, internet and stores voicemails mE on the server. Thanks for guidance.