A Phone’s Gotta Connect… it takes 2 or more!
| System | Vendor/Brand | Type | # of Lines | Notes | Pic |
| Definity ECS R9 (Compact Modular Cabinet hardware) | Avaya | Digital PBX | 8X32
1 8 CO Line 1 8 DCP Line (4 Wires) 1 24 DCP Line (2 Wires) 1 16 Analog Line (licensed to 300 stations) |
Acquired in 2015, a vast majority of the desktop hardware in the following years came for free.
Caller ID is supported but would require forklifts between the CO card and the Analog line |
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| ICP 3300CX | Mitel | IP PBX | 16 licensed IP stations, 6 CO trunks | Christmas gift in 2015 |  |
| 1760V | Cisco | IP PBX | Up to 24 Cisco’s IP and or SIP extensions, 2 outside line via VICFXS2 | Acquired in 2013, not in production for years | |
| G250DCP | Avaya | TDM/IP PBX | 12 DCP ports, 2 analog station, 2 CO lines, supposedly 16 VOIP stations | If there is no media server that handles PBX, the Avaya has Survivable system inside, but it’s very primitive. | |
| SIP24 | Citel Portico | Analog Telephone Gateway | 24 FXS ports
The Gateway can be tied to have multiple phone numbers dialing the port. |
System prefers to interconnect to an Asterisk type of PBX. No survivability. You can’t call another phone number on the gateway, it must route through the SIP server over IP | |
| Issabel | Asterisk derivative, away from the direct drama of FreePBX. Version 4 ran on CentOS, and it’s now replaced with Version 5, it’s actually a fork from Elastix (a brand name acquired by 3CX but abandoned the code) | Unified PBX system | Limited to the server’s compatibility | The system is virtualized to interconnect all the VOIP and legacy system. It has a modified interface that was derived from Elastix |