Mike's PBX Cookbook

Special Number Routing

Special Number Routing

The steps:

1The Special Number Network Translation locates the SPN dialed by the user, and determines a Route List for the call.

4The route determines a trunk. If LD 86 ESN, TGAR=YES (not default), the users Trunk Group Restriction is checked.
2The Route List (RLI) lists possible route entries, each with an FRL, and DMI for this route type, in the order of preference. 5Different routes may require Digit Manipulation (DMI) to modify digits in order to make the digit string compatible.
3The facility restriction level (FRL) for a RLI entry restricts access from an NCOS less than this value (see note below).

6 A trunk is selected, and the (modified) digit string sent. Audio is cut-through, and call setup completed.

Note: An FRL (0-7) is assigned to each NCOS in LD 87 NCTL, and determines which RLI entries it can access. FRL 0 is the most restrictive, 7 is the least restrictive. Therefore, if NCOS and FRL are equal, a higher value NCOS will have fewer restrictions.

What to print?

To build a complete picture of what happens after dialing an access code followed by an SPN, collect the following data:

Overlay, CommandsDescripton
LD 87: PRT, NCTL, 0 9Print NCOS to FRL relationship (1:1?)
LD 90: PRT, NET, SUM, <enter>Print Network Translation Summary (and find AC1/2)
LD 90: PRT, NET, AC1 (AC2), SPN, <enter> Print Special Numbers for each access code (AC1/2)
LD 86: PRT, RLB, <enter>Print the Route List entries
LD 86: PRT, DGT, <enter>Print the Digit Manipulation tables (if used)
LD 21: LTM, <enter>List Trunk Members (enter for all routes)

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