WB2REM VOIP Board Comparison
| FEATURES | VoIP-ECHOLINK Rev.C | AMI-2 (All Mode Interface) | ULI (Ultimate Linking Interface) |
| DTMF decoder | X | X | X |
| Isolated PTT relay | X | X | X |
| Receives DTMF tones from Internet | X | ||
| Audio Monitoring | X | ||
| Local Microphone | X | ||
| Local PTT Control | X | ||
| Sound Card Modes (PSK31, CW etc) | X | X | X |
| Adjustable AF level to soundcard | X | X | |
| TX Control | |||
| Serial RTS | X | X | X |
| ASC II | X | X | X |
| Serial DTR | X | X | 2 |
| RX Control | |||
| VOX | X | X | X |
| COS (Carrier operated squelch) | X | X | |
| Adjustable COS Level | X | ||
| Fixed COS Level | X | ||
| COS Voltage Level Inversion | X | X | |
| Other Features | |||
| Adjustable TX Timeout | X | X | X |
| RJ45 Connection | X | ||
| CAT Output | X | ||
| Programmable User Functions | X | ||
| Built In PIC Programmer | |||
| Notes: | |||