Talkswitch 24-CA User Manual page 97

Minimum required time between DTMF digits:
The default setting of 65ms is generally adequate for most environments. In
most problem cases, increase the value a bit to help the system deal with
echoed digits seen from cell phones. For example: Calls keep being
misdirected to extension 111. This usually indicates that even though the
caller may have dialed 113, TalkSwitch sees 1113 because the '1' was echoed
by the cell phone network. Once TalkSwitch captures 3 digits, it ignores the
rest, hence the digits '111' are accepted and the '3' is ignored.
Line CPC/Disconnect Clear
If calls are accidentally disconnected in mid conversation, it usually
indicates a problem with the telephone line. TalkSwitch is always looking
for a 'hang-up' signal from the phone company called a CPC or Disconnect
Clear signal. If the line has 'shorts' or the line card at the central office is
defective, CPC signals in the 250ms range might come down the line and
cause TalkSwitch to hang-up. Try increasing this value if this seems to be
occurring.
Ringback Control
If an extension seems to ring back as if a caller was on hold, but when
answered, no one is there, it could indicate a debounce problem with the
phone hook/switch. When someone at the extension hangs up, the handset
bounces slightly to cause a flash signal that can be seen by TalkSwitch
before the hang up. As a result, TalkSwitch puts the line on hold. To help
with this problem, increase this value till it stops the ringbacks.
T A L K S W I T C H C O N F I G U R A T I O N 8 9