Inbound call on POTS line comes up as CONF- unable to answer the call

[SuperMagMan]

Hello,
My customer states that intermittently, calls coming in show CONF on display and they are unable to answer the call, just dead air. I'm thinking an issue with the carrier, however, what would cause the call to come in as CONF??

Any help would be greatly appreciated.

Thank you,
Greg Stahl

 

[Apersons]

Check all the numbers. Inbound Trunk numbers that ring to station groups and what phones are in the groups. might unhook the line from the box and test with a buttset to see if the carrier is the problem.