Applications on the KX-TDA 15 & KX-TDA 30 include:

Voicemail
Call Management Software
Cordless Telephony (DECT)
Integrated Headsets
Computer Telephony Integration (CTI)
Remote Branches and Home Worker Solution

Version 2.0 KX-TDA15 & KX-TDA30 has the option of a simple voicemail card, offering features including;

Simple Voicemail Log (callers name, number, time and status) plus New / Old status
Suitable for all extensions
Extension users can record their own OGM (Outgoing Going Message)
Different OGM's in day, lunch, break, night modes
Message notification (change in dial tone and message lamp)
Direct recording
Up to 125 messages can be recorded (per card)
Recording time 40/60*/120 minutes per card (*Default)