The Gigaset N300A IP is a separate base station, which combines the advantages of calling via the Internet with calling via an analog network. You can conduct a VoIP call and a call via the landline at the same time for example. Thanks to HDSP technology, your calls will be crystal clear. Even when you can't answer the phone, people will still be able to reach you with the Gigaset N300A IP. With 3 integrated answering machines, offering a total recording time of 30 minutes, there's plenty of space for your contacts to leave a message. You can listen to any left messages remotely, and you can be notified by SMS when you receive a new message.The following handsets support all of the N300A's functions: SL78H, SL400H, S800H, S79H, and C59H. The following handsets support the N300A's most important functions: E49H and SL37H.