Gathering call-routing and dial plan requirements is an important step in the IPT design phase. The requirements collected here dictate how to plan for route patterns, partitions, route groups, and route list designs in CallManager.
The first step is to gather the information on the existing numbering plan, as shown in Tables E-8 through E-10. If you have collected this information earlier, you can use that information; otherwise, gather this information before starting the dial plan design on the CallManager.
Site Name | On-Net Site Access Code | No. of Digits in Station Numbering Plan | DID Ranges | Station Directory Numbering Ranges | Telephony Feature Pilot Numbers | Site-Level DID | No. of CoRs Required |
|---|---|---|---|---|---|---|---|
No. | Question | Answer |
|---|---|---|
1 | Are there any conflicts with current legacy numbering ranges? If yes, identify them and work on the dial plan to resolve them. | |
2 | Do you have any conflicts of dialing plans with other locations? When you are migrating from a distributed PBX or key system (A key system is a multiline phone system with basic features such as conferencing, transfer, or intercom. You can think of the key system as a scaled down version of the PBX system.) deployment to a centralized IPT deployment, you need to identify how many digits are used in each site for local dialing. If there is a conflict in the numbering plans between the sites, you should consider increasing the number of digits required to avoid the overlapped numbering ranges. | |
3 | Do you want to retain the existing dialing behavior? | |
4 | Is digit translation needed? (Example: Prefix digits, discard digits, append digits, changing the calling party/called party number and so on.) | Specify: |
5 | Do you have a toll-free number requirement? | Specify: |
No. | Type of Calls | Call-Routing Preferences, in Order of Priority |
|---|---|---|
1 | Local | Local gateway Central site gateway via IP WAN |
Emergency | Local gateways only | |
Long distance | Local gateway Central site gateway via IP WAN | |
International | Central site gateway via IP WAN Local gateway Remote site 2 gateways | |
Toll bypass | Central site gateway via IP WAN Site 2 gateways Local gateway | |
To international offices | Central site gateway via IP WAN Local gateway |
List the DID requirements. DID is a PBX or Centrex feature that permits outside calls to be placed directly to a station line without use of an operator.