Panasonic KX-TAW848 Features Manual page 311

Programming References
4.11.4 DISA—Message Setting [5-3-2]
Feature Guide References
1.15.6 Direct Inward System Access (DISA)
Doorphone Call Duration Time
Specifies the length of time until the ringing stops and the call is canceled when there is no answer.
Default
30 s
Value Range
10 × n (n=1–15) s
Programming References
4.11.1 Doorphone [5-1]
Feature Guide References
1.15.1 Doorphone Call
Doorphone Call Duration Limitation Time
Specifies the length of time until a doorphone call is disconnected.
Default
60 s
Value Range
10 × n (n=0–30) s
Programming References
4.11.1 Doorphone [5-1]
Feature Guide References
1.15.1 Doorphone Call
Door Open Duration Time
Specifies the length of time the door stays unlocked.
Default
5 s
Value Range
2–7 s
4.8 System [2]
Feature Guide 311