Normally the person making the call , controls the call, so the recipient can temporarily hang up , and come back and the call hasn’t cleared ( typically answering the call on one handset and then continuing the call on a different handset ) the call doesn’t clear immediately.
There were some small changes made relatively recently by BT where the time before the ‘called party clear’ signal was acted upon, so that a called party could call out quickly , and not be held up by the previous incoming call not hanging up, but this ‘called party clear’ signal is not necessarily within the control of the outgoing call provider, obviously a BT to BT customer is, but a call from a BT customer to a non BT customer isn’t.
If the company you called has there own ‘system’ setup to send a ‘called party clear’ signal at whatever time they think appropriate , for example, if after the ‘your call is important, we will deal with you ASAP’ , they have a policy to clear the call after 2 hours , irrespective of the call being dealt with, there is nothing the company you use to make the call , can do about that .
It could also be your outgoing provider also limits the duration, but that’s less likely, a call answered and getting music on hold appears identical to a call answered and a conversation taking place , so your provider is not likely to simply cut the call off after what it thinks is an appropriate length of time…basically if Disney want to cut the call off after a period they chose, they can.
Listening to the initial ‘ringtone’ is different, your call provide can and will terminate your call if you sit and want to let a call ring out for hours , but this is the ringtone before the call is answered with an announcement saying ‘you are in a queue ‘, if they reapply ringtone while you wait, the call is still answered as far as your provider is concerned .
