| Features | | Cisco ATA186/ATA188 | |
|
| |  | |
| Blind Transfer | | yes | |
| Call and Line Appearances | | | |
| Call Appearances/line | | 2 | |
| Line Appearances | | 1 Per Physical Line | |
| Physical Lines | | 2 | |
| Call Deflection | | | |
| Forward All | | yes | |
| Forward Busy | | yes | |
| Forward No Answer | | yes | |
| Call Waiting | | yes | |
| Can be used with Interaction Client | | yes | |
| Codecs | | | |
| Additional Codecs | | None | |
| G.711alaw | | yes | |
| G.711ulaw | | yes | |
| G.723.1 | | yes | |
| G.726 | | no | |
| G.729AB | | yes - one line only | |
| GSM | | no | |
| RFC 3389 (VAD/CNG) | | yes | |
| Conference | | yes | |
| Consult Transfer | | yes | |
| Current Firmware | | 3.2(1) | |
| Delayed Media | | yes | |
| DHCP | | yes | |
| Dial Plan Capabilities | | | |
| Dial Plan Routing | | no | |
| Dial Plan Termination | | yes | |
| DTMF | | | |
| Inband | | yes | |
| RFC 2833 | | yes | |
| Faxing | | | |
| Passthrough Faxing | | yes - G.711 only | |
| T.38 Fax | | no | |
| T.38 Faxing with security (TLS/SRTP) | | no | |
| FXO Ports | | no | |
| FXS Ports | | 2 | |
| Headset Jack | | Dependent on analog phone | |
| Hold | | yes | |
| Mute | | Dependent on analog phone | |
| MWI | | yes - stutter tone | |
| NAT Support | | yes | |
| Network Interface | | 10/100 FD | |
| Proxy Capabilities | | | |
| Backup Proxy | | yes | |
| Destination Proxy | | yes | |
| Outbound Proxy | | yes | |
| RFC 3263 | | yes | |
| QoS | | | |
| 802.1p/Q | | yes | |
| ToS | | yes | |
| Re-Invite Support | | yes | |
| RS-232 Serial Port | | ATA186 - no ATA188 - yes | |
| Security | | | |
| SRTP | | no | |
| TLS | | no | |
| Speakerphone | | Dependent on analog phone | |
| Speed dial Buttons | | Dependent on analog phone | |
| Termination Character | | # | |
| TFTP/FTP configuration | | yes | |
| Voicemail button | | Set a speed-dial to VM direct | |
| Web server configuration | | yes | |
