Avaya Configuring Dial Services Bedienungsanleitung PDF herunterladen (Seite 129)

Implementation Notes for All Dial Services

117353-B Rev. 00

5-15

Placing Multirate Calls

Both ends of a connection must support multirate for it to work. You enable

multirate and specify the transmission rate of each multirate call when you

configure an outgoing phone number for a circuit. (For specific instructions, see

“Enabling PRI Multirate” on page 13-17.) Each multirate call can operate at a

different transmission rate. You determine the transmission rate by specifying the

number of B channels the circuit can use for a phone number. The greater the

number of B channels, the faster the transmission rate because the circuit has more

bandwidth.

You can place several multirate calls over the same PRI connection; however, the

total number of B channels for each call cannot exceed the number of lines in the

pool or the number of lines supported by the network switch. If there are no

available B channels in the line pool, the call fails.

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.

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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Avaya Configuring Dial Services Bedienungsanleitung Seite 129