What are the disadvantages of using an ATA device, as opposed to an IP phone?

What are the disadvantages of using an ATA device, as opposed to an IP phone?

Jim Gurol (VP of Operations, Tierzero) gives expert video advice on: What is an ATA VoIP system?; Who can I call using the ATA VoIP system?; How does an ATA VoIP system work? and more...

Well, on the ATA system, you're using your analog phone, so you might not get all the features with a PC phone that has, they might have more buttons like hold and transfer. On ATA, you're getting your standard phone so you have to get a feature turned on, you have to use either star codes or the flash hook to switch over to another call. So you're using the standard ways you would use your phone to activate features.