This is a list of phones known as definitely working or definitely not working.
All phones not listed in the below categories/manufacturers are untested or unknown. Please help us to enlarge this list and add your experiences here or use one of our support channels.

If you are going to buy a new phone for an event, keep in mind that a Gigaset will most likely work. They have proven to be the most compatible with our system.

• Aastra/DeTeWe/Mitel
  • 6xxc/d (full featured incl. phone book)
• Alcatel
  • Mobil Reflexes 300, 400 (no Encryption)
• AEG
  • D81 (no caller-id?)
• Cisco
  • SPA302D (no Encryption)
• Gigaset
  • 3000 Comfort
  • Gigaset A415
  • Gigaset AL240
  • Gigaset C300
  • Gigaset C430
  • Gigaset C1000
  • Gigaset SL1/SL2 [colour] [professional]
  • Gigaset E630 HX (displays number only)
• Telekom
  • Speedphone 10

• Telekom Sinus 207 Pack (token registration does not work, only inbound calls on temporary number)

• Alcatel-Lucent 8232
• AVM FRITZ!Fons (the used alerting-pattern semantics are not defined in the standard. Problem reported to AVM 02/2018, complain to Support)
• SNOM DECT Handsets