atl telecom Delta 40
Stand alone answering machine with 40 minutes recording time and 4 mailboxes.
 
Perfect for the Small Office Home Office.
 
 

BT Response 75
With stand alone answering machines becoming a rarity these days you may be concerned over having such a limited choice but fortunately the BT Repsonse 75 actually has a wealth of features which will cover the majority of a user's needs.

Retell 332
A professional business class answering machine with up to 50 minutes recording time, 4 greeting messages and message transfer to a pre-programmed telephone number.
Vastly superior recording quality over cheaper home/small business answering machines.
 

Retell 540 office
A professional business class answering machine with up to 60 minutes recording time, 6 OGM's, 4 mailboxes, message transfer to a pre-programmed telephone number, SMS.
Excellent recording quality. Audio in/out connections.