Keep a Line on Hold

I have a CICS with 6.0 software. I would like to put Line 2 on hold for long periods of time, so I can talk on Line 1 without interuption, if I'm alone in the office.

I tried putting Line 2 on hold. It eventually rang back and ultimately released itself from the CICS. I tried starting a phone call by dialing the prefix digits, then laying the phone on the desk. Eventually, it also cleared itself and became available.

Is there any way to do this?

Thanks. Jim