General Knoppix support for those who've read the FAQ at the Wiki
Grandstream GS-HT802 2 Port Analog Telephone Adapter VoIP Phone & Device, Black
$32.00
Polycom VVX 411 IP VOIP POE Gigabit Telephone [L/N] BUSINESS OFFICE RECEPTION
$24.00
Lot Of 7 Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$41.99
* Used * Yealink IP Phone SIP-T48S Business Office VOIP 16 Lines 7"
$59.99
Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$3.00
Yealink SIP-T54W W/ HD Display Business VoIP Phone w/ Built-in Bluetooth and POE
$69.99
Grandstream DP720 Dect Cordless VoIP Telephone - Black
$30.00
Cisco 7962 Series CP-7962G Unified VoIP IP Business Phone
$6.99
Polycom VVX 411 IP VOIP POE Gigabit Telephone ONSIP GOOGLE VOICE ZOOM MEETING
$24.00
Polycom VVX 250 Business IP Phone with 2.8 in. Color Display & Ethernet, Black
$24.74