Why do VoIP calls remain active after the phone call is ended?

For our small business needs, we use a Linksys PAP for our IP telephony service. Sometimes though, we noticed that the call will remain active after we have ended the call and hung up. How do we configure the ATA or gateway to avoid this problem?

I would suggest checking your timeout settings. They may be too high. Also, make sure you have the latest software and firmware loads for your Linksys -- there may have been upgrades to address these issues.