Eicon Networks DIVA LAN ISDN - Manual (Page 95)

Chapter Seven: Setting up the Phone Ports Call bumping 95
Call bumping
Call bumping, more formally known as dynamic bandwidth allocation (DBA), allows you to share the ISDN
line between data and analog calls. This enables you to send and receive faxes, or make phone calls, while at
the same time downloading data from the Internet with your computers.
How it works
When you enable call bumping, incoming or outgoing analog calls can bump one B-channel of an active data
connection to gain access to the ISDN line. This ensures that a line is almost always available for your voice or
fax calls.
A sample call bumping scenario
• A data connection using MLPPP is in progress. It is currently using both ISDN channels to transfer a large
database (both B-channel LEDs are green).
• Suddenly, that important phone call you were expecting arrives. As soon as the phone rings, the data
connection automatically drops one of the ISDN B-channels, reducing throughput from 128 kbps to 64
kbps, and the voice call is connected. One of the B-channel LEDs will change from green to orange,
indicating a voice call is active.
• When the call is done you hang up the phone. Automatically, the data connection re-establishes the
second B-channel and brings throughput back up to 128 kbps.
Call bumping works in the same manner if you pick up the phone and place an outgoing call.
Requirements
To support call bumping:
• you must be using Multilink PPP (MLPPP), as your connection protocol. See the section “Choose a
connection protocol” on page 20 for more information on MLPPP.
• your ISDN line must support the Call Waiting supplementary service.
To enable call bumping
1. On the Manual Configuration menu, click ISDN and phone ports. The DIVA LAN ISDN Modem displays
the ISDN line parameters page.
2. Click the Enable Call Bumping check box.
3. Click Save.
4. Click Reset.