Panasonic KX-TDE100 Features Manual page 361

[Quick Dialling Table]
Quick Dialling No.
720
If the call cannot be completed using the VoIP network, and the dialled leading number is found in the Quick
Dialling Table, the call will be automatically rerouted to a trunk as specified by the corresponding destination
number.
When a call is made using the VoIP network, if the PBX does not receive a reply from the other PBX within
about 4 seconds of making the call, or an error is returned, the call is rerouted to a public trunk as specified.
Conditions
• Some QSIG services are available. (→ 1.30.4 QSIG Standard Features)
• TRS/Call Barring settings apply to calls rerouted to public trunks.
Feature Guide References
1.30.1 TIE Line Service
Destination No.
9012345
1.30 Networking Features
Feature Guide 361