CID info holding over from last call and announcing, when no CID transmitted?

[JKaplan]

When I get a call that doesn't have any CID information, UltraCID announces using the last CID it received. This is confusing my family, as it may say (for instance) that grandma is calling when in fact it's someone at our gate trying to get in (the gate "calls" the house, providing no CID information).

Is there a way to clear the old CID information out, say in 30 seconds after the first ring (or some other solution)? I'm not sure if this issue originates with UltraCID or with the modem itself...

Thanks for any help,

Jerry