
Configuring Dial Services
4-16 114062 Rev. B
Call setup across the D channel is simple. You set up a call only once, regardless
of how many B channels are in use.
Incoming Call Filtering
Incoming call filtering is a security feature that works with the ISDN caller ID
service. Incoming call filtering lets the router filter incoming calls based on the
calling party’s phone number. This feature is available for BRI and PRI service.
The router filters incoming calls based on a list of phone numbers that you specify
in an incoming phone list. The phone number you enter must exactly match the
phone number that the switch sends to the router. If the phone number is included
in the router’s list, the router accepts the call. If not, the router rejects the call. This
ensures that only authorized users have access to your network.
To activate this feature, enable the Incoming Filter parameter and create an
incoming phone list. Refer to Chapter 12 for instructions.
Rate Adaption
Rate adaption enables the router to accommodate data transmission 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.
Note: If you enable multirate calls across a bandwidth-on-demand circuit, 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 dial-up lines
that help reduce congestion on a leased line.
Caution: To use incoming call filtering, you must purchase caller ID service
from your ISDN service provider. If you enable incoming call filtering without
caller ID service, the router rejects all incoming calls.
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