
Configuring Dial Services
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If you configure multirate for bandwidth-on-demand service, you must configure
each line’s external clock speed. Line speed is critical to balancing traffic across a
multilink bundle, which is a group of switched lines that aids a congested leased
line.
Call Screening
Call screening is a security feature that works with calling line ID, a service that
you purchase from your ISDN provider. Call screening lets the router filter
incoming calls based on the calling party’s phone number. This feature is
available for BRI and PRI service.
When you enable call screening, the router filters incoming calls based on a list of
phone numbers that you create. If the phone number is included in the router’s list,
it accepts the call. If not, it does not answer the call. This ensures that only
authorized users have access to your network.
To activate call screening on your router, you enable the incoming filter function
(refer to Chapter 7) and specify a list of incoming phone numbers (refer to
Chapter 11).
Rate Adaption
Rate adaption enables the router to accommodate data transmitting at a rate of
56 Kb/s over a 64 Kb/s B channel. Bay Networks only supports 56 Kb/s adapted
to 64 Kb/s using the ITU-T V.110 type of rate adaption. You can enable rate
adaption for BRI and PRI service.
For incoming calls, the router automatically adapts the data received at 56 Kb/s to
the 64 Kb/s channel based on information in the call setup packet. For outgoing
calls, the router sets the rate to either 64 Kb/s or 56 Kb/s, depending on how you
configure the rate adaption parameters.
To determine which rate you select, ask the service provider for information about
the network and the connection of the destination device. For information about
configuring rate adaption, refer to Chapter 7 and Chapter 11.
Caution: To use call screening, you must purchase calling line ID service. If
your ISDN provider does not offer calling line ID and you enable call
screening, the router rejects all incoming calls.
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