AT&T SB67030 User Manual page 290

Symptom
Calls dropped.
Unable to find a way to turn 
on Do Not Disturb or Call
Forward All.
Troubleshooting
Synapse SB67030 and Accessories User's Guide
Probable Cause
Restoring Deskset settings
while that extension is in use
causes all calls to be dropped.
Cordless Handset lost link
with the Deskset.
The network is down.
The telephone line was
disconnected while on an
outside call.
Putting the T1 Gateway into
loopback test mode prevents
phone calls from occurring.
These functions can only be
enabled on the Deskset.
Corrective Action
Update software and restore Deskset settings only in Idle

mode with no calls pending.
Verify that your Cordless Handset battery is charged and

that it is within range of the Deskset.
Update software and restore Deskset settings only in Idle

mode with no calls pending.
Verify that your office network is active and that your

Deskset has power.
Ensure that the Ethernet cable is securely plugged into

the network port beneath your Deskset labeled
that the other end is plugged into your office LAN.
Ask the system administrator to check the connections

between the Gateways and the telephone service.
Do not run loopback tests while the T1 trunk is in use.

To activate Do Not Disturb (DND) or Call Forward All,

press or
mode.
290
Cordless Handset
and
on the Deskset while in Idle