
Chapter 24 Dialing plans 235
Networking Configuration Guide
• dialing an access code for a long-distance carrier
• deciding which line pool to use according to the time and day
You can set up routing to take advantage of any leased or discounted routes using information
supplied by the customer. The system cannot tell what lines are cheaper to use.
For Call-by-Call service selection (PRI only), the installer defines destination codes for various
call types over PRI lines (for example, Foreign Exchange, TIE Trunk, or OUTWATS). The user
dials a number using the intercom button without entering any special information. For more
information see “Provisioning for Call-by-Call limits with PRI” on page 238.
Routing configuration
The settings for a call routing include:
• a three-digit route number (000-999)
• external # digits (up to 24 digits)
• a line pool
• destination codes (max. of 500 available, up to 12 digits)
• DN type and/or Service Type
• public and private DN lengths
• a schedule (optional)
Configuring Call-by-Call services
Call-by-Call service selection (CbC) allows you to access services or private facilities over a PRI
line without the need for dedicated facilities. The different services represent different types of
access to the network.
Refer to the following information:
• “Call-by-Call services” on page 236
• “Switches supporting Call-by-call limits” on page 237
• “Provisioning for Call-by-Call limits with PRI” on page 238
Warning: Plan your routing service before you do any programming.
Routing affects every call placed in the system and must be carefully planned to avoid
conflicts and gaps in the programming. Use tables to design routes and destination codes,
then check for potential problems before you start programming. It also saves you time
when all the settings are written out in front of you.
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