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
$29.99
Lot Of 7 Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$41.99
Cisco 8841 CP-8841-K9 VoIP Business IP Phone (Charcoal)
$46.00
Grandstream GS-HT802 2 Port Analog Telephone Adapter VoIP Phone & Device, Black
$32.00
Cisco CP-7945G VOIP Phone With Stand & Handset Business IP Phone 7945
$3.00
Lightly Used Cisco 8811 Series VoIP phone Factory Reset great condition
$19.95
Cisco/Linksys SPA2102 VoIP Phone Adapter Router 2FXS (Unlocked)
$16.99
Polycom VVX310 VoIP Phone Skype Business Edition 6 Lines Ethernet Ports 3 Way
$24.99
Grandstream GXP1625 Small-Medium Business HD IP Phone POE VoIP LCD Display
$27.07
Grandstream DP750 DECT VoIP Base Station 3 Way Audio Conferencing - (Black)
$26.39