Yes you can set it for 1-10 minute timeout and it also has a dial tone detect feature where if it hears 5 seconds of dial tone it will disconnect.It should work

Call Length Time Out
This feature selects the maximum length of time that calls can
be connected. Programmable in increments of 1 minute up to
a maximum of 9 minutes. Programming nothing in the time
value location will disable the call length time out. With the call
length disabled, the E-10A/E-20B phone must rely on CPC,
busy, silence or return dial tone to hang-up. Use the chart at
the right. * Note: The factory default is 5 minutes.


So if you use the timeout feature you don't have to have a cpc signal according to the documentation

Last edited by pvj; 07/27/17 02:56 PM.