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
Fanvil V64 VOIP Business Phone- Black *NEW/OPEN BOX*
$89.99
* Used * Yealink IP Phone SIP-T48S Business Office VOIP 16 Lines 7"
$59.99
NEW Polycom VVX 501 VoIP IP Phone & Stand Tested VVX501 2200-48500-019 Lync
$43.98
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
Polycom VVX 411 IP VOIP POE Gigabit Telephone [L/N] BUSINESS OFFICE RECEPTION
$24.00
Cisco 7962 Series CP-7962G Unified VoIP IP Business Phone
$6.99
Lot Of 7 Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$41.99
Polycom VVX 411 IP VOIP POE Gigabit Telephone ONSIP GOOGLE VOICE SKYPE MEETING
$24.00