| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AASTRA TELECOM (UK) LIMITED | 03743207 | 31/01/2015 | Dissolved |
| Artaurus Software Ltd | 04232219 | 01/02/2002 | Dissolved |
| CALLVIEW LIMITED | 03697295 | 24/12/2007 | Dissolved |
| COMM SOURCE EUROPE LIMITED | 04470314 | 24/12/2007 | Dissolved |
| MITEL FINANCIAL SERVICES LIMITED | 04294360 | 21/03/2002 | Dissolved |
| MITEL TELECOM LIMITED | 03523477 | 19/02/2003 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| EDICT TRAINING LIMITED | SC197970 | 10/02/2003 | 11/11/2003 | Strike Off |
| ISCA NETWORKS CORPORATION LIMITED | 06425716 | 05/02/2008 | 28/11/2011 | Dissolved |
| MITEL NETWORKS HOLDINGS LIMITED | 04186471 | 23/03/2001 | 08/02/2016 | Silver |
| MITEL NETWORKS LIMITED | 01309629 | 05/01/2000 | 16/02/2001 | Bronze |
| SHIPTON COMMUNICATIONS PENSION TRUSTEES LIMITED | 01549080 | 16/09/1998 | 15/03/2001 | Dissolved |
| SWAN SOLUTIONS LIMITED | 03062945 | 15/10/2007 | 08/02/2016 | Dissolved |