I am having a similar problem. My DECT phone will not make/accept calls, even though the deskphone (VVX 400) says it is paired. Here are the steps:
1. My deskphone is on the 5.5.0.20556 Firmware
2. The VVX 400 has the D60 Profile Enabled
3. the VVX 400 says the Base Station is paired.
4. VVX 400 model says that there is 1 handset registered.
5. The D60 is registered with the base station
Despite all this, there is a white telephone on my handset that has a red circle with a white minus sign in it. My VVX 400 has a green icon on its upper right that indicates it is paired and ready to use. Calls to my number will ring on my deskphone, but will not ring on my D60.
Please help.
Joseph T.