atcomsystems.ca/forum Forums TDM Business Telephone Systems Toshiba Telephones & Systems using SIP phones with CIX 670

Here's a list of the ones that we know will work so far.

WIP5000(duh!)
Spectralink/Polycom 8002 Wireless
Uniden UIP200(another duh!)
Polycom Soundpoint IP 501(Works great and looks nice too) my favorite.

So far those are the only ones that work even remotely well.
Some others that were not so good:
-DLINK DPH540(at times you could only make calls and not receive but a reboot would clear it)
-Sipura 841(Never actually got it to be able to make calls, but it would receive)
-X-Lite softphone(would register and then crash the phone switch when you tried to use it)
-UT Starcom F3000(This one had promise but ended up being too unreliable quality wise)

I also have it on good authority that Cisco Phones loaded with the SIP firmware image will work now. Your CIX must have the latest software version.