| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AASTRA TELECOM (UK) LIMITED | 03743207 | 31/01/2015 | Dissolved |
| CALLVIEW LIMITED | 03697295 | 07/07/2008 | Dissolved |
| COMM SOURCE EUROPE LIMITED | 04470314 | 07/07/2008 | Dissolved |
| CONNECTED HOTELS LIMITED | 09064844 | 01/06/2015 | Dissolved |
| CORVISA EUROPE LTD | 09361349 | 25/09/2017 | Dissolved |
| INTER-TEL EUROPE LIMITED | 02331050 | 16/08/2007 | Not Trading |
| MITEL EUROPE LIMITED | 09059484 | 16/06/2017 | Silver |
| MITEL HOSPITALITY COMMUNICATIONS 1 LIMITED | 09106445 | 01/06/2015 | Dissolved |
| MITEL HOSPITALITY COMMUNICATIONS 2 LIMITED | 01763604 | 01/06/2015 | Dissolved |
| MITEL NETWORKS HOLDINGS LIMITED | 04186471 | 07/07/2008 | Silver |
| MITEL NETWORKS LIMITED | 01309629 | 07/07/2008 | Bronze |
| MITEL TELECOM LIMITED | 03523477 | 16/08/2007 | Dissolved |
| OAISYS LIMITED | 07081078 | 04/03/2014 | Dissolved |
| SHORETEL UK LIMITED | 05947793 | 25/09/2017 | Dissolved |
| SWAN SOLUTIONS LIMITED | 03062945 | 16/08/2007 | Dissolved |
| TELEPO LIMITED | 05839778 | 31/01/2015 | Dissolved |
| UNIFY ENTERPRISE COMMUNICATIONS LIMITED | 05903714 | 30/09/2023 | Silver |
| UNIFY ENTERPRISE UK HOLDINGS LIMITED | 06690346 | 30/09/2023 | One Red Flag |
| UNIFY HOLDING UK 1 LIMITED | 14811050 | 30/09/2023 | Bronze |
| UNIFY UK INTERNATIONAL LIMITED | 09660071 | 30/09/2023 | Not Trading |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| MAVENIR SYSTEMS HOLDINGS LIMITED | 05181808 | 17/07/2015 | 28/02/2017 | Dissolved |
| MAVENIR SYSTEMS UK LIMITED | 04388973 | 17/07/2015 | 28/02/2017 | Bronze |
| STOKE UK LIMITED | 05480017 | 18/06/2015 | 28/02/2017 | Dissolved |