Using the international dial plan installers from Cisco and the @ symbol for route patterns has two major shortcomings:
- You can't easily see what numbers can or can't be dialled
- You're at the mercy of Cisco updating it, which can lag a long way behind changes in the dial plan
So whenever I do a Communications Manager installation I manually define the PSTN access route patterns. Ofcom do publish the specifications of the
UK Numbering Plan online, below is the route patterns for a simplified version.
| Route Pattern | Description |
| 00! | International dialling |
| 101 | Non-emergency police services |
| 111 | Non-emergency healthcare services |
| 112 | Emergency services |
| 123 | Talking clock |
| 999 | Emergency services |
| 116XXX | Services of social value |
| 118XXX | Directory enquiry services |
| 08001111 | ChildLine |
| 08454647 | NHS Direct |
| 0[12]XXXXXXXXX | Geographic area codes |
| 03[0347]XXXXXXXX | Nationwide numbers at geographic rates |
| 055XXXXXXXX | Corporate numbers |
| 056XXXXXXXX | Location independant electronic communications services |
| 070XXXXXXXX | Personal numbering service |
| 07[1-9]XXXXXXXX | Mobile/pager services |
| 0[58]0XXXXXXX | 10-digit Freephone |
| 080XXXXXXXX | Freephone |
| 082XXXXXXXX | Internet for schools |
| 084[3-5]XXXXXXX | Special services basic rate |
| 0870XXXXXXX | Non-geographic numbers |
| 087[1-3]XXXXXXX | Special services higher rate |
| 09XXXXXXXXX | Premium rate services |
Uk 01 numbers can be 9 or 10 digits in length. How do you cater for this?
ReplyDeleteRoute patterns for 9 or 10 digits can be implemented, but then CUCM will wait for additional digits until either 11 digits are dialled or the inter-digit timeout happens, as there's multiple possible matches. The inter-digit timeout can be avoided via en bloc dialling or route patterns with a terminating digit (e.g. #), but both these methods require changing user dialling behaviour.
ReplyDeleteWith CME there's no option but to use T for inter-digit timeout, as dial-peer matching logic would always trigger the 1st match, which would be the 9 digit pattern.
Is this dial plan still in use for the UK? Im trying to setup a London Office.
ReplyDeleteIt's pretty much still correct - NHS Direct number doesn't exist anymore & there's a 119 service number for booking Covid-19 tests.
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