Trying a fresh SSA number but it disconnects immediately on BobRTC? It's not just you that's happening to. It also happens with the few of us who use dialers against SSA numbers.
Before moving on to another number, try using Rapid Redial. More often than not, an SSA scammer hangs up when all the agents are currently on the phone. Some agents will hangup the first several calls they get before deciding to answer. Most of the agents have trained themselves that by hanging up series of calls they can get dialers to stop calling them. If any of these tactics are in practice, Rapid Redial defeats it since it just nakedly calls 50 times straight up and it quickly redials on hangup.
More often than not I am able to raise an agent at an SSA scam number this way.