I did a quick search and found several people with this problem since 2006 or longer. It doesn't seem possible they can put "call waiting" down on their feature list in this condition. Sure, it lets you pick up the 2nd call, but it is almost useless if you can't go back to the first or toggle.

For "mainstream" people coming from the POTS world, this will be expected. I hope the new ATA resolves this.

I have the same question as mentioned already. Will I get a new ATA for this reason? Thanks again.