Call Queue: Can't Answer New Call at Phone That Came in While on First Call

We are a small office with three people in the queue for calls coming in on the main number. The calls ring simultaneously at each of our phones. However, several times I've been the only one here and have answered a call. Before I am able to forward that call, a second call comes in. I transfer the first call and even though I hang up and the second call is still coming in (I can see and hear it ringing at the other two phones), I am unable to pick it up unless I go to the desk of one of the other two people in the queue. I did change the setting for "minimum post-call wrap up time before agent's status is automatically set to available" from 10 seconds to 0. Will that solve the problem of being unable to pick up a second call that came in while I was still on the first call? Or is that not a solution and there's another way of handling this?