I tried some cheap I.P. phones from i-p-net.com.
They are located on the U.K.
The phone registered on the Quintum and I was able to make calls from phone to Quintum ,but not the other way. It will be disconected after few minutes.
Also tried with those Ericsson blue boxes that someone was selling on e-bay. I was not able to make it register with the Tenor.
I will like to know if anyone ever got the ATA 186 working with Quintum.