Panasonic EB-A100 - Manual (Page 63)

60 Messages Menu
Validity period
You can set the duration that your message is stored at the
Message centre.
From Messages
1.
4 Settings A (Select)
2. 4 Validity period A (Set)
3. 4 Select required setting from Maximum, 1 Hour, 12
Hours, 1 Day, or 1 Week A (Select)
Delivery report
You can request a delivery report regarding the status of a
sent message.
From Messages
1.
4 Settings A (Select)
2. 4 Delivery report A (On/Off)