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Configuring Dial Services
3-6
If you select this option, Site Manager enables you to select only those available
channels for communication. For example, if the provider offers channels B1
through B6, you select only channels 1 through 6 in the PRI Timeslots
configuration window (refer to Chapter 4). You should not select all the B
channels. Your configuration should match your service.
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.
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 4) and specify a list of incoming phone numbers (Chapter 6) for
instructions.
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 follows the ITU-T V.110
specification that defines how to adapt transmission rates.
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 the rate adaption, refer to Chapter 4 and Chapter 6.
The following two examples describe how rate adaption works.
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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