Panasonic KX-TD500 - Manual (Page 205)

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Programming Guide 205
Parameter Call Forwarding-No Answer Time
Default 0 ring
Value Range 0-12 rings
Description/Function Specifies the number of rings before the Call Forwarding No
Answer feature is activated.
If a call is not answered before the programmed number of rings,
the call is redirected to the pre-assigned extension.
Notes
• This timer is also used for Intercept Routing. If an incoming
DISA call to the Intercept Routing destination is not
answered before this timer expires, the call will be
disconnected.
• If "0" is specified, "Call Forwarding-No Answer Time" in
Section "2.5 System Timer" setting works.
Reference • 1.11 Transferring Features (F/G)
– Call Forwarding
• 2.5.1 Forwarding Your Calls (Call Forwarding) (U/M)
• 2.5 System Timer (P/G)