Quiz: Summary of Networking in a Multi Branched Organization

Acme Rubber Chicken (www.AcmeRubberChicken.com, NASDAQ AcRuC) has offices located in a stylish office complex in suburban Hazel, KY.  Here the company management oversees the production of comedy accessories.  A warehouse location houses many of the operational aspects of the company.  Both buildings have a small PBX installed and these are connected by private trunk lines.  The company is revamping their telecommunications and has directed you to design a new infrastructure.  Currently they lease a block of numbers (270-398-3400 through 3499) from the local exchange carrier.  The local exchange uses 7 digits for a local call.


The first assignment is to develop a dial plan for the voice network.  One stipulation from management is that they want to use 3 digits for all calls within the company.  Also the company has had trouble with some employees calling 900 number services and wants to block them.  Customers dial 1-888-244-2536 to reach the customer support center and their call is automatically forwarded to one of the customer support representatives automatically by an Automatic Call Distributer (ACD).  You do not have to handle the forwarding – only getting the traffic to the ACD.  There are no on-net calls to the customer support ACD.

The different groups have the following numbers of people:

Management:  4

Sales: 5

Production: 8

Shipping: 6

Business Support: 7

Safety: 2

Quality Control:  2

Customer Support:  14

Document all required switchboard information

Summary of Points:

Numbers are a more restricted asset than numerous individuals figure it out.

It might be difficult to fall down to a solitary server without changing the augmentations of one or more gatherings of clients.

To abstain from numbering clashes, the customer may require longer expansions than one may expect, construct exclusively in light of the quantity of augmentations the customer really employments.

Movement of Voice Mail servers and different extras, for example, CMS must be considered also.

The call routing process is as follows:

  1. A subscriber in NYC dials 1-888-244-2536
  1. The local CO in NYC recognizes that the 1 means this is not a local call and forwards the call to a long-distance carrier in NYC.
  1. The long-distance carrier in NYC recognizes 703 as an area code in Kentucky and forwards the call to a long-distance carrier in Kentucky.
  1. The long-distance carrier in Kentucky forwards the call to the local CO.
  1. The local CO delivers the call to the correct subscriber.

Number clashes are quite often present amid a solidification, particularly when an expansive number of existing systems are included. Presently for our situation as we are not beginning sans preparation, we could undoubtedly make a dial plan with 3-digit extensions and loads of space for development, for example, the accompanying:

At last, Trunk Access Codes (TACs) must be appointed extraordinarily for every trunk bunch in the combined system. Since clients typically utilize ARS, AAR, or UDP to place outside calls, just the overseer needs to know the system TACs. On the other hand, the scope of TACs utilized on one once in the past free system (e.g., 7xx) may struggle with a scope of extensions the customer wishes to relegate in the merged system (e.g., 799-0958).

Accept three workplaces are united into a solitary server. Nearby trunks convey DID movement inbound to every office. Clients at every office dial four digits to achieve others in the same office. After the union, the dial plan is as per the following:


The customer can utilize ARS to control whether calls between workplaces go over neighborhood PSTN trunks and/or the corporate WAN. On the off chance that the WAN is the better course, then ARS Digit Conversion can change a dialed number, for example, 9-1-912-524-6246 to extension 524-6246 and regard the call as an “on-switch” call. Something else, ARS Analysis sends the dialed number to a Route Pattern and after that over a nearby PSTN trunk bunch. Area 4.6covers nearby trunking in point of interest.


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