The minimum requirements for 24U Phone Companion are -
PowerPC G3 Macintosh with Mac OS X 10.4 and FileMaker Pro 8 or 300 MHz Pentium PC with Microsoft Windows 2000 and FileMaker Pro 8
Whilst the plug-in is completely cross platform, some telephone switches may require the middleware to be installed on a Windows PC. A detailed list of supported PBX models and operating systems is listed in the documentation accompanying the plug-in. Support for other brands and models may be possible to add on demand. Please contact Linear Blue to check Phone Companion's compatibility with a specific telephone switch.
Below is a full list of all supported phone systems - please note - some systems may require PBX add-ons.
| PBX Model | Required Add-on | Operating System |
| Ascotel IntelliGate 150 | OIP server | Windows 2000, 2003, and XP |
| Ascotel IntelliGate 300 | OIP server | Windows 2000, 2003, and XP |
| Ascotel IntelliGate 2025 | OIP server | Windows 2000, 2003, and XP |
| Ascotel IntelliGate 2045 | OIP server | Windows 2000, 2003, and XP |
| Ascotel IntelliGate 2065 | OIP server | Windows 2000, 2003, and XP |
| Alcatel 4200 | Alcatel CSTA licenses | Mac OS X, Linux, Windows |
| Alcatel Office E | Alcatel CSTA licenses | Mac OS X, Linux, Windows |
| Alcatel 4400 | Alcatel CSTA licenses | Mac OS X, Linux, Windows |
| Alcatel OmniPCX Office | Alcatel CSTA licenses | Mac OS X, Linux, Windows |
| Alcatel OmniPCX Enterprise | Alcatel CSTA licenses | Mac OS X, Linux, Windows |
| Auerswalk COMpact 5010 VoiP | LAN TAPI licenses | Windows 2000, 2003, and XP |
| Auerswald COMpact 5020 VoIP | LAN TAPI licenses | Windows 2000, 2003, and XP |
| Auerswald COMmander Basic.2 | LAN TAPI licenses | Windows 2000, 2003, and XP |
| Auerswald COMmander Basic.2 19" | LAN TAPI licenses | Windows 2000, 2003, and XP |
| Auerswald COMmander Business | LAN TAPI licenses | Windows 2000, 2003, and XP |
| Auerswald COMmander Business 19" | LAN TAPI licenses | Windows 2000, 2003, and XP |
| AVAYA Integral i5 (Tenovis) | Tenovis Connection NT | Mac OS X, Linux, Windows |
| AVAYA Integral i55 (Tenovis) | Tenovis Connection NT | Mac OS X, Linux, Windows |
| AVAYA IP Office | None | Windows 2000, 2003, and XP |
| AVAYA ACM | ASAI Link | Mac OS X, Linux, Windows |
| Cisco CallManager | None | Mac OS X, Linux, Windows |
| Cisco CallManager Express | None | Mac OS X, Linux, Windows |
| Deutsche Telekom T-Octopus E30 | HG1500 board | Mac OS X, Linux, Windows |
| Deutsche Telekom T-Octopus E930 | HG1500 board | Mac OS X, Linux, Windows |
| Deutsche Telekom T-Octopus F200 | HG1500 board | Mac OS X, Linux, Windows |
| Deutsche Telekom T-Octopus F400/F600 | HG1500 board | Mac OS X, Linux, Windows |
| Deutsche Telekom T-Octopus Open | CSTA Server Licences | Mac OS X, Linux, Windows |
| Ericsson MD 110 | Possibly KX-TDA0410X CTI board | Windows 2000, 2003, and XP |
| Ericsson MX-ONE | TAPI Drivers | Windows 2000, 2003, and XP |
| Ericsson BusinessPhone | TAPI Drivers | Windows 2000, 2003, and XP |
| NEC Aspire | None | Windows 2000, 2003, and XP |
| Panasonic KX-TDA 100/200 | Possibly KX-TDA0410X CTI board | Windows 2000, 2003, and XP |
| Panasonic KX-TDA 15 | TAPI Drivers | Windows 2000, 2003, and XP |
| Panasonic KX-TDA 30 | TAPI Drivers | Windows 2000, 2003, and XP |
| Siemens Hicom 150 E OfficeCom | Xpress@LAN or LIM-LAN (none in Linux) | Mac OS X, Linux, Windows |
| Siemens Hicom 150 E OfficePro | Xpress@LAN or LIM-LAN (none in Linux) | Mac OS X, Linux, Windows |
| Siemens Hicom 150 E OfficePoint | Xpress@LAN or LIM-LAN | Mac OS X, Linux, Windows |
| Siemens HiCom 300 (from 2.0) | CAP 2.0 with CA | Mac OS X, Linux, Windows |
| Siemens Hipath 3300/3350 (OfficePoint) | Board: HG1500 or LIM-LAN | Mac OS X, Linux, Windows |
| Siemens Hipath 3300/3350 (OfficeCom) | Board: HG1500 or LIM-LAN | Mac OS X, Linux, Windows |
| Siemens Hipath 3300/3350 (OfficePro) | Board: HG1500 or LIM-LAN | Mac OS X, Linux, Windows |
| Siemens Hipath 3800 | Board: HG1500 or LIM-LAN | Mac OS X, Linux, Windows |
| Siemens Hipath 4000 | CAP 2.0 with CA | Mac OS X, Linux, Windows |
| 4s newcom blue4s | None | Mac OS X, Linux, Windows |