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Correct as of 04/01/2012
CUCM Available Range is currently: (0207679 9000-9080 and 0207679 9082-9899) 09000-09080 and 09082-09899. Other ranges will be made available use CUCM demand on numbers increases.
Other ranges in use for CUCM but restricted for general use are 53800-53873 and 53874-53909. Current use of 59xxx ranges should not be extended.
| Main A | ||||
| 51000-51999 | Full Range | Notes | ||
| 51000-51999 | General TDM | |||
| 51200-51299 | C3 System | |||
| 51300-51899 | General TDM | |||
| 51900-51999 | VIP Mobility Numbers | These numbers are routed directly to the VIP system | ||
| Main B | ||||
| 54000-54999 | Full Range | |||
| 54000-54999 | General TDM use | |||
| Torrington Place | ||||
| 53000-53999 | Full Range | |||
| 53000-53599 | General TDM Use | |||
| 53600-53999 | Allocation | 53800-53873 | Routed to CUCM | |
| 53874-53909 | CASA 90 Tottenham Court Road | |||
| Rayne | ||||
| 52000-52999 | Full Range | |||
| 52000-52399 | General TDM Use | |||
| 52400-52999 | Reserved for ICH | |||
| Chemistry | ||||
| 55000-55999 | Full Range | |||
| 55900-55999 | Bartlett Energy CH | Routed from CIB to CH for iSDXm | ||
| 55000-55899 | General TDM Use | |||
| Wolfson | ||||
| 56000-56999 | Full Range | |||
| IPT Ranges | ||||
| 57000-57999 | Not in Use | |||
| 58000-58999 | Not in Use | |||
| 59000-59997 | Allocation | 59700-59996 | ISD | |
| 59000-59699 | General IPT Allocation |