There are three main BCM 50 Models within the stable. In addition, there are additional expansion modules that you can purchase. Please see the links below for more details:

BCM 50
The standard BCM 50 has a large number of important features but does not come with an integrated router.

BCM 50e
The BCM 50e comes with all of the features of the standard BCM 50 in addition to an ethernet router.

BCM 50a
The BCM 50a comes with all of the features of the standard BCM 50 in addition to an ADSL router.

BCM 50 Expansion
The BCM 50 Expansion chassis allows for the expansion in the number of trunks and stations on any BCM 50.

BCM Convergence Applications at a Glance:

Application:	BCM 50	BCM 200	BCM 400
Voice over IP (user side)	Yes	Yes	Yes
Voice and Fax over IP (trunk side)	Yes	Yes	Yes
Unified messaging on user's PC	Yes	Yes	Yes
Dymanic Address Allocation	Yes	Yes	Yes
"Instant Office" Capabilities	Yes	Yes	Yes
IP Virtual Private Networks	Yes	Yes	Yes
Multimedia Contact Centres	No	Yes	Yes
Call Centre Reporting	No	Yes	Yes
IP Music on Hold	No	Yes	Yes
Interactive Vocie Response	No	Yes	Yes
IP Messaging Networking among Sites	Yes	Yes	Yes
Integrated Managemnt of UPSs	Yes	Yes	Yes
Robust IP Security	Yes	Yes	Yes
Remote and Centralised Administration	Yes	Yes	Yes