said by OmagicQ:That would be a good idea. However I have noticed that when a call is on hold, the audio stops so maybe the 5 minute timer is to prevent accidental disconnects of calls on hold.
I don't know about CC's software, but at least on our setup the timeout for "regular" no-RTP and on-hold no RTP are different values. I would assume it's the same on CC but up to them to confirm.