Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 278)

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278 Chapter 24 Dialing plans

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Example: If users are used to dialing 9-1-555-1234-<DN number> to reach another system

(whose DN codes start with 6), you create a destination code of 915551236A, using the VoIP

line pools (users dial the destination code plus the DN of the telephone they want to reach on

the other system). The letter A at the end of the code represents any number from 0 to 9 which

is not used by any other destination code.

If you need to use PSTN lines for a specific connection on the other system, you can create a

destination code specific to that destination number and attach it to the route set up with the

PSTN line pool (for example, 915551236333, 6333 being the DN of the device on the other

system. When the user dials that specific number, the call will always go over the PSTN line).

Note that by entering this code, users dialing with the code in the previous paragraph could

never dial any DN that started with 63XX.

• If you want to use VoIP lines as your main lines, but you want to program one or more PSTN

lines as fallback lines, you need to configure the

routing and routing schedules so that the user

dials the same number, regardless of which routes get used. You use the external number

dialout string and absorb digits fields under the schedules in Destination code programming

for this purpose.

• If a company wants to use VoIP lines between sites for interoffice calls, but not necessarily for

all the voice traffic, they can configure specific destination codes for the VoIP routes. In this

case, the destination code contains the same digits as a user would dial for a PSTN line, thus,

making the shift transparent to the user and, at the same time, ensuring that the most

economical route is being used. Depending on how many exceptions there are, you can use the

wild card at the end of the string to save yourself from the necessity of entering a number of

destination codes with the same leading digits.

Configuring Absorbed length

The digit absorption setting (Absorbed Length) applies only to the destination code digits.

When the Absorbed Length is at 0, the actual digits dialed by a caller are preserved in the dialout

sequence. As you increase the absorbed length the equivalent number of digits are removed from

the beginning of the destination code.

Adding Carrier access codes to destination codes

In some instances, long distance service uses the same lines as local service but is switched to a

specific carrier using an access number, which is sometimes referred to as a carrier access code

(CAC). Route programming can include the access number so the users do not have to dial it every

time they make a long distance call. Figure 88 shows an example of how the system interprets

what the user dials into a valid outgoing call.

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Avaya BCM 4.0 Networking Guide de configuration Page 278

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